[RFC PATCH 01/10] vdpa: add get_config_size callback in vdpa_config_ops

[Stefano Garzarella]

This new callback is used to get the size of the configuration space
of vDPA devices.

Signed-off-by: Stefano Garzarella <sgarz...@redhat.com>
---
 include/linux/vdpa.h              | 4 ++++
 drivers/vdpa/ifcvf/ifcvf_main.c   | 6 ++++++
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 6 ++++++
 drivers/vdpa/vdpa_sim/vdpa_sim.c  | 9 +++++++++
 4 files changed, 25 insertions(+)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 4ab5494503a8..fddf42b17573 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -150,6 +150,9 @@ struct vdpa_iova_range {
  * @set_status:                        Set the device status
  *                             @vdev: vdpa device
  *                             @status: virtio device status
+ * @get_config_size:           Get the size of the configuration space
+ *                             @vdev: vdpa device
+ *                             Returns size_t: configuration size
  * @get_config:                        Read from device specific configuration 
space
  *                             @vdev: vdpa device
  *                             @offset: offset from the beginning of
@@ -231,6 +234,7 @@ struct vdpa_config_ops {
        u32 (*get_vendor_id)(struct vdpa_device *vdev);
        u8 (*get_status)(struct vdpa_device *vdev);
        void (*set_status)(struct vdpa_device *vdev, u8 status);
+       size_t (*get_config_size)(struct vdpa_device *vdev);
        void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
                           void *buf, unsigned int len);
        void (*set_config)(struct vdpa_device *vdev, unsigned int offset,
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 7c8bbfcf6c3e..2443271e17d2 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -332,6 +332,11 @@ static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device 
*vdpa_dev)
        return IFCVF_QUEUE_ALIGNMENT;
 }
 
+static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
+{
+       return sizeof(struct virtio_net_config);
+}
+
 static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
                                  unsigned int offset,
                                  void *buf, unsigned int len)
@@ -392,6 +397,7 @@ static const struct vdpa_config_ops ifc_vdpa_ops = {
        .get_device_id  = ifcvf_vdpa_get_device_id,
        .get_vendor_id  = ifcvf_vdpa_get_vendor_id,
        .get_vq_align   = ifcvf_vdpa_get_vq_align,
+       .get_config_size        = ifcvf_vdpa_get_config_size,
        .get_config     = ifcvf_vdpa_get_config,
        .set_config     = ifcvf_vdpa_set_config,
        .set_config_cb  = ifcvf_vdpa_set_config_cb,
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c 
b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 10e9b09932eb..78043ee567b6 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1814,6 +1814,11 @@ static void mlx5_vdpa_set_status(struct vdpa_device 
*vdev, u8 status)
        ndev->mvdev.status |= VIRTIO_CONFIG_S_FAILED;
 }
 
+static size_t mlx5_vdpa_get_config_size(struct vdpa_device *vdev)
+{
+       return sizeof(struct virtio_net_config);
+}
+
 static void mlx5_vdpa_get_config(struct vdpa_device *vdev, unsigned int 
offset, void *buf,
                                 unsigned int len)
 {
@@ -1900,6 +1905,7 @@ static const struct vdpa_config_ops mlx5_vdpa_ops = {
        .get_vendor_id = mlx5_vdpa_get_vendor_id,
        .get_status = mlx5_vdpa_get_status,
        .set_status = mlx5_vdpa_set_status,
+       .get_config_size = mlx5_vdpa_get_config_size,
        .get_config = mlx5_vdpa_get_config,
        .set_config = mlx5_vdpa_set_config,
        .get_generation = mlx5_vdpa_get_generation,
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index d5942842432d..779ae6c144d7 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -439,6 +439,13 @@ static void vdpasim_set_status(struct vdpa_device *vdpa, 
u8 status)
        spin_unlock(&vdpasim->lock);
 }
 
+static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
+{
+       struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+       return vdpasim->dev_attr.config_size;
+}
+
 static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
                             void *buf, unsigned int len)
 {
@@ -566,6 +573,7 @@ static const struct vdpa_config_ops vdpasim_config_ops = {
        .get_vendor_id          = vdpasim_get_vendor_id,
        .get_status             = vdpasim_get_status,
        .set_status             = vdpasim_set_status,
+       .get_config_size        = vdpasim_get_config_size,
        .get_config             = vdpasim_get_config,
        .set_config             = vdpasim_set_config,
        .get_generation         = vdpasim_get_generation,
@@ -593,6 +601,7 @@ static const struct vdpa_config_ops 
vdpasim_batch_config_ops = {
        .get_vendor_id          = vdpasim_get_vendor_id,
        .get_status             = vdpasim_get_status,
        .set_status             = vdpasim_set_status,
+       .get_config_size        = vdpasim_get_config_size,
        .get_config             = vdpasim_get_config,
        .set_config             = vdpasim_set_config,
        .get_generation         = vdpasim_get_generation,
-- 
2.29.2