Re: [PATCH net-next v3 05/11] virtio_net: Create a FF group for ethtool steering

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Sep 23, 2025 at 09:19:14AM -0500, Daniel Jurgens wrote:
> All ethtool steering rules will go in one group, create it during
> initialization.


document uapi changes pls.

> Signed-off-by: Daniel Jurgens <danielj@nvidia.com>
> Reviewed-by: Parav Pandit <parav@nvidia.com>
> Reviewed-by: Shahar Shitrit <shshitrit@nvidia.com>
> ---
>  drivers/net/virtio_net/virtio_net_ff.c | 25 +++++++++++++++++++++++++
>  include/uapi/linux/virtio_net_ff.h     |  7 +++++++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/net/virtio_net/virtio_net_ff.c b/drivers/net/virtio_net/virtio_net_ff.c
> index 61cb45331c97..0036c2db9f77 100644
> --- a/drivers/net/virtio_net/virtio_net_ff.c
> +++ b/drivers/net/virtio_net/virtio_net_ff.c
> @@ -6,6 +6,9 @@
>  #include <net/ip.h>
>  #include "virtio_net_ff.h"
>  
> +#define VIRTNET_FF_ETHTOOL_GROUP_PRIORITY 1
> +#define VIRTNET_FF_MAX_GROUPS 1
> +
>  static size_t get_mask_size(u16 type)
>  {
>  	switch (type) {
> @@ -30,6 +33,7 @@ void virtnet_ff_init(struct virtnet_ff *ff, struct virtio_device *vdev)
>  	size_t ff_mask_size = sizeof(struct virtio_net_ff_cap_mask_data) +
>  			      sizeof(struct virtio_net_ff_selector) *
>  			      VIRTIO_NET_FF_MASK_TYPE_MAX;
> +	struct virtio_net_resource_obj_ff_group ethtool_group = {};
>  	struct virtio_net_ff_selector *sel;
>  	int err;
>  	int i;
> @@ -92,6 +96,12 @@ void virtnet_ff_init(struct virtnet_ff *ff, struct virtio_device *vdev)
>  	if (err)
>  		goto err_ff_action;
>  
> +	if (le32_to_cpu(ff->ff_caps->groups_limit) < VIRTNET_FF_MAX_GROUPS) {
> +		err = -ENOSPC;
> +		goto err_ff_action;
> +	}
> +	ff->ff_caps->groups_limit = cpu_to_le32(VIRTNET_FF_MAX_GROUPS);
> +
>  	err = virtio_device_cap_set(vdev,
>  				    VIRTIO_NET_FF_RESOURCE_CAP,
>  				    ff->ff_caps,
> @@ -121,6 +131,17 @@ void virtnet_ff_init(struct virtnet_ff *ff, struct virtio_device *vdev)
>  	if (err)
>  		goto err_ff_action;
>  
> +	ethtool_group.group_priority = cpu_to_le16(VIRTNET_FF_ETHTOOL_GROUP_PRIORITY);
> +
> +	/* Use priority for the object ID. */
> +	err = virtio_device_object_create(vdev,
> +					  VIRTIO_NET_RESOURCE_OBJ_FF_GROUP,
> +					  VIRTNET_FF_ETHTOOL_GROUP_PRIORITY,
> +					  &ethtool_group,
> +					  sizeof(ethtool_group));
> +	if (err)
> +		goto err_ff_action;
> +
>  	ff->vdev = vdev;
>  	ff->ff_supported = true;
>  
> @@ -139,6 +160,10 @@ void virtnet_ff_cleanup(struct virtnet_ff *ff)
>  	if (!ff->ff_supported)
>  		return;
>  
> +	virtio_device_object_destroy(ff->vdev,
> +				     VIRTIO_NET_RESOURCE_OBJ_FF_GROUP,
> +				     VIRTNET_FF_ETHTOOL_GROUP_PRIORITY);
> +
>  	kfree(ff->ff_actions);
>  	kfree(ff->ff_mask);
>  	kfree(ff->ff_caps);
> diff --git a/include/uapi/linux/virtio_net_ff.h b/include/uapi/linux/virtio_net_ff.h
> index a35533bf8377..662693e1fefd 100644
> --- a/include/uapi/linux/virtio_net_ff.h
> +++ b/include/uapi/linux/virtio_net_ff.h
> @@ -12,6 +12,8 @@
>  #define VIRTIO_NET_FF_SELECTOR_CAP 0x801
>  #define VIRTIO_NET_FF_ACTION_CAP 0x802
>  
> +#define VIRTIO_NET_RESOURCE_OBJ_FF_GROUP 0x0200
> +
>  struct virtio_net_ff_cap_data {
>  	__le32 groups_limit;
>  	__le32 classifiers_limit;
> @@ -52,4 +54,9 @@ struct virtio_net_ff_actions {
>  	__u8 reserved[7];
>  	__u8 actions[];
>  };
> +
> +struct virtio_net_resource_obj_ff_group {
> +	__le16 group_priority;
> +};
> +
>  #endif
> -- 
> 2.45.0