Commit 65b70958 authored by Stefano Garzarella's avatar Stefano Garzarella Committed by Michael S. Tsirkin
Browse files

vdpa_sim: add get_config callback in vdpasim_dev_attr 



The get_config callback can be used by the device to fill the
config structure.
The callback will be invoked in vdpasim_get_config() before copying
bytes into caller buffer.

Move vDPA-net config updates from vdpasim_set_features() in the
new vdpasim_net_get_config() callback.
This is safe since in vdpa_get_config() we already check that
.set_features() callback is called before .get_config().

Signed-off-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20201215144256.155342-13-sgarzare@redhat.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent f37cbbc6

drivers/vdpa/vdpa_sim/vdpa_sim.c

+21 −14
Original line number Diff line number Diff line
@@ -68,6 +68,8 @@ struct vdpasim_virtqueue { 
#define VDPASIM_NET_FEATURES	(VDPASIM_FEATURES | \

				 (1ULL << VIRTIO_NET_F_MAC))



struct vdpasim;



struct vdpasim_dev_attr {

	u64 supported_features;

	size_t config_size;
@@ -75,6 +77,7 @@ struct vdpasim_dev_attr { 
	u32 id;



	work_func_t work_fn;

	void (*get_config)(struct vdpasim *vdpasim, void *config);

};



/* State of each vdpasim device */
@@ -530,8 +533,6 @@ 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 =

		(struct virtio_net_config *)vdpasim->config;



	/* DMA mapping must be done by driver */

	if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
@@ -539,16 +540,6 @@ static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features) 


	vdpasim->features = features & vdpasim->dev_attr.supported_features;



	/* We generally only know whether guest is using the legacy interface

	 * here, so generally that's the earliest we can set config fields.

	 * Note: We actually require VIRTIO_F_ACCESS_PLATFORM above which

	 * implies VIRTIO_F_VERSION_1, but let's not try to be clever here.

	 */



	config->mtu = cpu_to_vdpasim16(vdpasim, 1500);

	config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP);

	memcpy(config->mac, macaddr_buf, ETH_ALEN);



	return 0;

}
@@ -603,7 +594,12 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset, 
{

	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);



	if (offset + len < vdpasim->dev_attr.config_size)

	if (offset + len > vdpasim->dev_attr.config_size)

		return;



	if (vdpasim->dev_attr.get_config)

		vdpasim->dev_attr.get_config(vdpasim, vdpasim->config);



	memcpy(buf, vdpasim->config + offset, len);

}
@@ -747,6 +743,16 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = { 
	.free                   = vdpasim_free,

};



static void vdpasim_net_get_config(struct vdpasim *vdpasim, void *config)

{

	struct virtio_net_config *net_config =

		(struct virtio_net_config *)config;



	net_config->mtu = cpu_to_vdpasim16(vdpasim, 1500);

	net_config->status = cpu_to_vdpasim16(vdpasim, VIRTIO_NET_S_LINK_UP);

	memcpy(net_config->mac, macaddr_buf, ETH_ALEN);

}



static int __init vdpasim_dev_init(void)

{

	struct vdpasim_dev_attr dev_attr = {};
@@ -755,6 +761,7 @@ static int __init vdpasim_dev_init(void) 
	dev_attr.supported_features = VDPASIM_NET_FEATURES;

	dev_attr.nvqs = VDPASIM_VQ_NUM;

	dev_attr.config_size = sizeof(struct virtio_net_config);

	dev_attr.get_config = vdpasim_net_get_config;

	dev_attr.work_fn = vdpasim_net_work;



	vdpasim_dev = vdpasim_create(&dev_attr);

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