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vDPA: allow userspace to query features of a vDPA device 

This commit adds a new vDPA netlink attribution
VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES. Userspace can query
features of vDPA devices through this new attr.

This commit invokes vdpa_config_ops.get_config()
rather than vdpa_get_config_unlocked() to read
the device config spcae, so no races in
vdpa_set_features_unlocked()

Userspace tool iproute2 example:
$ vdpa dev config show vdpa0
vdpa0: mac 00:e8:ca:11:be:05 link up link_announce false max_vq_pairs 4 mtu 1500
  negotiated_features MRG_RXBUF CTRL_VQ MQ VERSION_1 ACCESS_PLATFORM
  dev_features MTU MAC MRG_RXBUF CTRL_VQ MQ ANY_LAYOUT VERSION_1 ACCESS_PLATFORM

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20220929014555.112323-2-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2022-09-29 09:45:50 +08:00 committed by Michael S. Tsirkin
parent e60d640742
commit 228565100d
2 changed files with 15 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/vdpa/vdpa.c
View File

@ -820,10 +820,10 @@ static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
{
struct virtio_net_config config = {};
u64 features;
u64 features_device, features_driver;
u16 val_u16;
vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config));
vdev->config->get_config(vdev, 0, &config, sizeof(config));
if (nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, sizeof(config.mac),
config.mac))
@ -837,12 +837,18 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
return -EMSGSIZE;
features = vdev->config->get_driver_features(vdev);
if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features,
features_driver = vdev->config->get_driver_features(vdev);
if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver,
VDPA_ATTR_PAD))
return -EMSGSIZE;
return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config);
features_device = vdev->config->get_device_features(vdev);
if (nla_put_u64_64bit(msg, VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, features_device,
VDPA_ATTR_PAD))
return -EMSGSIZE;
return vdpa_dev_net_mq_config_fill(vdev, msg, features_driver, &config);
}
static int

4
include/uapi/linux/vdpa.h
View File

@ -46,6 +46,7 @@ enum vdpa_attr {
VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, /* u32 */
/* virtio features that are supported by the vDPA management device */
VDPA_ATTR_DEV_SUPPORTED_FEATURES, /* u64 */
VDPA_ATTR_DEV_QUEUE_INDEX, /* u32 */
@ -54,6 +55,9 @@ enum vdpa_attr {
VDPA_ATTR_DEV_FEATURES, /* u64 */
/* virtio features that are supported by the vDPA device */
VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, /* u64 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,
};