[v2,4/7] libqos: add MSI-X callbacks to QVirtioPCIDevice

The MSI-X vectors are programmed differently in the VIRTIO 1.0 and
Legacy interfaces.  Introduce callbacks so different implementations can
be used depending on the interface version.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 tests/libqos/virtio-pci.h | 12 ++++++++++++
 tests/libqos/virtio-pci.c | 37 ++++++++++++++++++++++++++++---------
 2 files changed, 40 insertions(+), 9 deletions(-)

Stefan Hajnoczi <stefanha@redhat.com> writes:

> The MSI-X vectors are programmed differently in the VIRTIO 1.0 and
> Legacy interfaces.  Introduce callbacks so different implementations can
> be used depending on the interface version.
>
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  tests/libqos/virtio-pci.h | 12 ++++++++++++
>  tests/libqos/virtio-pci.c | 37 ++++++++++++++++++++++++++++---------
>  2 files changed, 40 insertions(+), 9 deletions(-)
>
> diff --git a/tests/libqos/virtio-pci.h b/tests/libqos/virtio-pci.h
> index 0d105d67b3..443e53affc 100644
> --- a/tests/libqos/virtio-pci.h
> +++ b/tests/libqos/virtio-pci.h
> @@ -14,16 +14,28 @@
>  #include "libqos/pci.h"
>  #include "libqos/qgraph.h"
>  
> +typedef struct QVirtioPCIMSIXOps QVirtioPCIMSIXOps;
> +
>  typedef struct QVirtioPCIDevice {
>      QOSGraphObject obj;
>      QVirtioDevice vdev;
>      QPCIDevice *pdev;
>      QPCIBar bar;
> +    const QVirtioPCIMSIXOps *msix_ops;
>      uint16_t config_msix_entry;
>      uint64_t config_msix_addr;
>      uint32_t config_msix_data;
>  } QVirtioPCIDevice;
>  
> +struct QVirtioPCIMSIXOps {
> +    /* Set the Configuration Vector for MSI-X */
> +    void (*set_config_vector)(QVirtioPCIDevice *d, uint16_t entry);
> +
> +    /* Set the Queue Vector for MSI-X */
> +    void (*set_queue_vector)(QVirtioPCIDevice *d, uint16_t vq_idx,
> +                             uint16_t entry);
> +};
> +
>  typedef struct QVirtQueuePCI {
>      QVirtQueue vq;
>      uint16_t msix_entry;
> diff --git a/tests/libqos/virtio-pci.c b/tests/libqos/virtio-pci.c
> index 4772239b61..651f6dbfc6 100644
> --- a/tests/libqos/virtio-pci.c
> +++ b/tests/libqos/virtio-pci.c
> @@ -271,6 +271,31 @@ static const QVirtioBus qvirtio_pci_legacy = {
>      .virtqueue_kick = qvirtio_pci_virtqueue_kick,
>  };
>  
> +static void qvirtio_pci_set_config_vector(QVirtioPCIDevice *d, uint16_t entry)
> +{
> +    uint16_t vector;
> +
> +    qpci_io_writew(d->pdev, d->bar, VIRTIO_MSI_CONFIG_VECTOR, entry);
> +    vector = qpci_io_readw(d->pdev, d->bar, VIRTIO_MSI_CONFIG_VECTOR);
> +    g_assert_cmphex(vector, !=, VIRTIO_MSI_NO_VECTOR);
> +}
> +
> +static void qvirtio_pci_set_queue_vector(QVirtioPCIDevice *d, uint16_t vq_idx,
> +                                         uint16_t entry)
> +{
> +    uint16_t vector;
> +
> +    qvirtio_pci_queue_select(&d->vdev, vq_idx);
> +    qpci_io_writew(d->pdev, d->bar, VIRTIO_MSI_QUEUE_VECTOR, entry);
> +    vector = qpci_io_readw(d->pdev, d->bar, VIRTIO_MSI_QUEUE_VECTOR);
> +    g_assert_cmphex(vector, !=, VIRTIO_MSI_NO_VECTOR);
> +}
> +
> +static const QVirtioPCIMSIXOps qvirtio_pci_msix_ops_legacy = {
> +    .set_config_vector = qvirtio_pci_set_config_vector,
> +    .set_queue_vector = qvirtio_pci_set_queue_vector,
> +};
> +
>  void qvirtio_pci_device_enable(QVirtioPCIDevice *d)
>  {
>      qpci_device_enable(d->pdev);
> @@ -285,7 +310,6 @@ void qvirtio_pci_device_disable(QVirtioPCIDevice *d)
>  void qvirtqueue_pci_msix_setup(QVirtioPCIDevice *d, QVirtQueuePCI *vqpci,
>                                          QGuestAllocator *alloc, uint16_t entry)
>  {
> -    uint16_t vector;
>      uint32_t control;
>      uint64_t off;
>  
> @@ -311,16 +335,12 @@ void qvirtqueue_pci_msix_setup(QVirtioPCIDevice *d, QVirtQueuePCI *vqpci,
>                     off + PCI_MSIX_ENTRY_VECTOR_CTRL,
>                     control & ~PCI_MSIX_ENTRY_CTRL_MASKBIT);
>  
> -    qvirtio_pci_queue_select(&d->vdev, vqpci->vq.index);
> -    qpci_io_writew(d->pdev, d->bar, VIRTIO_MSI_QUEUE_VECTOR, entry);
> -    vector = qpci_io_readw(d->pdev, d->bar, VIRTIO_MSI_QUEUE_VECTOR);
> -    g_assert_cmphex(vector, !=, VIRTIO_MSI_NO_VECTOR);
> +    d->msix_ops->set_queue_vector(d, vqpci->vq.index, entry);
>  }
>  
>  void qvirtio_pci_set_msix_configuration_vector(QVirtioPCIDevice *d,
>                                          QGuestAllocator *alloc, uint16_t entry)
>  {
> -    uint16_t vector;
>      uint32_t control;
>      uint64_t off;
>  
> @@ -348,9 +368,7 @@ void qvirtio_pci_set_msix_configuration_vector(QVirtioPCIDevice *d,
>                     off + PCI_MSIX_ENTRY_VECTOR_CTRL,
>                     control & ~PCI_MSIX_ENTRY_CTRL_MASKBIT);
>  
> -    qpci_io_writew(d->pdev, d->bar, VIRTIO_MSI_CONFIG_VECTOR, entry);
> -    vector = qpci_io_readw(d->pdev, d->bar, VIRTIO_MSI_CONFIG_VECTOR);
> -    g_assert_cmphex(vector, !=, VIRTIO_MSI_NO_VECTOR);
> +    d->msix_ops->set_config_vector(d, entry);
>  }
>  
>  void qvirtio_pci_destructor(QOSGraphObject *obj)
> @@ -371,6 +389,7 @@ static void qvirtio_pci_init_legacy(QVirtioPCIDevice *dev)
>  {
>      dev->vdev.device_type = qpci_config_readw(dev->pdev, PCI_SUBSYSTEM_ID);
>      dev->vdev.bus = &qvirtio_pci_legacy;
> +    dev->msix_ops = &qvirtio_pci_msix_ops_legacy;
>      dev->vdev.big_endian = qtest_big_endian(dev->pdev->bus->qts);
>  }

Reviewed-by: Sergio Lopez <slp@redhat.com>

On 11/10/2019 10.56, Stefan Hajnoczi wrote:
> The MSI-X vectors are programmed differently in the VIRTIO 1.0 and
> Legacy interfaces.  Introduce callbacks so different implementations can
> be used depending on the interface version.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  tests/libqos/virtio-pci.h | 12 ++++++++++++
>  tests/libqos/virtio-pci.c | 37 ++++++++++++++++++++++++++++---------
>  2 files changed, 40 insertions(+), 9 deletions(-)

Reviewed-by: Thomas Huth <thuth@redhat.com>