[PATCH v4 11/18] vdpa_sim: make 'config' generic and usable for any device type

From: Stefano Garzarella
Date: Tue Dec 15 2020 - 09:47:47 EST


Add new 'config_size' attribute in 'vdpasim_dev_attr' and allocates
'config' dynamically to support any device types.

Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index ccb40501cbd7..4a0a6cadb9ff 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -70,6 +70,7 @@ struct vdpasim_virtqueue {

struct vdpasim_dev_attr {
u64 supported_features;
+ size_t config_size;
int nvqs;
u32 id;

@@ -84,7 +85,8 @@ struct vdpasim {
struct vdpasim_dev_attr dev_attr;
/* spinlock to synchronize virtqueue state */
spinlock_t lock;
- struct virtio_net_config config;
+ /* virtio config according to device type */
+ void *config;
struct vhost_iotlb *iommu;
void *buffer;
u32 status;
@@ -384,6 +386,10 @@ static struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
goto err_iommu;
set_dma_ops(dev, &vdpasim_dma_ops);

+ vdpasim->config = kzalloc(dev_attr->config_size, GFP_KERNEL);
+ if (!vdpasim->config)
+ goto err_iommu;
+
vdpasim->vqs = kcalloc(dev_attr->nvqs, sizeof(struct vdpasim_virtqueue),
GFP_KERNEL);
if (!vdpasim->vqs)
@@ -524,7 +530,8 @@ static u64 vdpasim_get_features(struct vdpa_device *vdpa)
static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
- struct virtio_net_config *config = &vdpasim->config;
+ struct virtio_net_config *config =
+ (struct virtio_net_config *)vdpasim->config;

/* DMA mapping must be done by driver */
if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
@@ -596,8 +603,8 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

- if (offset + len < sizeof(struct virtio_net_config))
- memcpy(buf, (u8 *)&vdpasim->config + offset, len);
+ if (offset + len < vdpasim->dev_attr.config_size)
+ memcpy(buf, vdpasim->config + offset, len);
}

static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
@@ -684,6 +691,7 @@ static void vdpasim_free(struct vdpa_device *vdpa)
if (vdpasim->iommu)
vhost_iotlb_free(vdpasim->iommu);
kfree(vdpasim->vqs);
+ kfree(vdpasim->config);
}

static const struct vdpa_config_ops vdpasim_config_ops = {
@@ -746,6 +754,7 @@ static int __init vdpasim_dev_init(void)
dev_attr.id = VIRTIO_ID_NET;
dev_attr.supported_features = VDPASIM_NET_FEATURES;
dev_attr.nvqs = VDPASIM_VQ_NUM;
+ dev_attr.config_size = sizeof(struct virtio_net_config);
dev_attr.work_fn = vdpasim_net_work;

vdpasim_dev = vdpasim_create(&dev_attr);
--
2.26.2