On 2020/12/4 上午1:05, Stefano Garzarella wrote:
The set_config callback can be used by the device to parse the
config structure modified by the driver.
The callback will be invoked, if set, in vdpasim_set_config() after
copying bytes from caller buffer into vdpasim->config buffer.
Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index f935ade0806b..03a8717f80ea 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -70,6 +70,7 @@ struct vdpasim_dev_attr {
work_func_t work_fn;
void (*get_config)(struct vdpasim *vdpasim, void *config);
+ void (*set_config)(struct vdpasim *vdpasim, const void *config);
};
/* State of each vdpasim device */
@@ -598,7 +599,15 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
const void *buf, unsigned int len)
{
- /* No writable config supportted by vdpasim */
+ struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
+
+ if (offset + len > vdpasim->dev_attr.config_size)
+ return;
+
+ memcpy(vdpasim->config + offset, buf, len);
+
+ if (vdpasim->dev_attr.set_config)
+ vdpasim->dev_attr.set_config(vdpasim, vdpasim->config);
}
static u32 vdpasim_get_generation(struct vdpa_device *vdpa)
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