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vdpa: device feature provisioning

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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: Eli Cohen <elic@nvidia.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220927074810.28627-2-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2022-09-27 15:48:08 +08:00 committed by Michael S. Tsirkin
parent 4959aebba8
commit 90fea5a800
3 changed files with 8 additions and 0 deletions
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5
drivers/vdpa/vdpa.c
View File

@ -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

1
include/linux/vdpa.h
View File

@ -104,6 +104,7 @@ struct vdpa_iova_range {
};
struct vdpa_dev_set_config {
u64 device_features;
struct {
u8 mac[ETH_ALEN];
u16 mtu;

2
include/uapi/linux/vdpa.h
View File

@ -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,
};