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vdpa_sim: add set_config callback in vdpasim_dev_attr 

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.

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20201215144256.155342-14-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefano Garzarella 2020-12-15 15:42:51 +01:00 committed by Michael S. Tsirkin
parent 65b709586e
commit c124a95e30
1 changed files with 10 additions and 1 deletions
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11
drivers/vdpa/vdpa_sim/vdpa_sim.c
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@ -78,6 +78,7 @@ struct vdpasim_dev_attr {
work_func_t work_fn; work_func_t work_fn;
void (*get_config)(struct vdpasim *vdpasim, void *config); void (*get_config)(struct vdpasim *vdpasim, void *config);
void (*set_config)(struct vdpasim *vdpasim, const void *config);
}; };
/* State of each vdpasim device */ /* State of each vdpasim device */
@ -606,7 +607,15 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset, static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
const void *buf, unsigned int len) 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) static u32 vdpasim_get_generation(struct vdpa_device *vdpa)