Commit 90fea5a8 authored by Jason Wang's avatar Jason Wang Committed by Michael S. Tsirkin
Browse files

vdpa: device feature provisioning 



This patch allows the device features to be provisioned through
netlink. A new attribute is introduced to allow the userspace to pass
a 64bit device features during device adding.

This provides several advantages:

- Allow to provision a subset of the features to ease the cross vendor
  live migration.
- Better debug-ability for vDPA framework and parent.

Reviewed-by: default avatarEli Cohen <elic@nvidia.com>
Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
Message-Id: <20220927074810.28627-2-jasowang@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 4959aebb

drivers/vdpa/vdpa.c

+5 −0
Original line number Diff line number Diff line
@@ -600,6 +600,11 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i 
		}

		config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);

	}

	if (nl_attrs[VDPA_ATTR_DEV_FEATURES]) {

		config.device_features =

			nla_get_u64(nl_attrs[VDPA_ATTR_DEV_FEATURES]);

		config.mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);

	}



	/* Skip checking capability if user didn't prefer to configure any

	 * device networking attributes. It is likely that user might have used

include/linux/vdpa.h

+1 −0
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ struct vdpa_iova_range { 
};



struct vdpa_dev_set_config {

	u64 device_features;

	struct {

		u8 mac[ETH_ALEN];

		u16 mtu;

include/uapi/linux/vdpa.h

+2 −0
Original line number Diff line number Diff line
@@ -52,6 +52,8 @@ enum vdpa_attr { 
	VDPA_ATTR_DEV_VENDOR_ATTR_NAME,		/* string */

	VDPA_ATTR_DEV_VENDOR_ATTR_VALUE,        /* u64 */



	VDPA_ATTR_DEV_FEATURES,                 /* u64 */



	/* new attributes must be added above here */

	VDPA_ATTR_MAX,

};