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vdpa: Support reporting max device capabilities 

Add max_supported_vqs and supported_features fields to struct
vdpa_mgmt_dev. Upstream drivers need to feel these values according to
the device capabilities.

These values are reported back in a netlink message when showing management
devices.

Examples:

$ auxiliary/mlx5_core.sf.1:
  supported_classes net
  max_supported_vqs 257
  dev_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ MQ \
               CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

$ vdpa -j mgmtdev show
{"mgmtdev":{"auxiliary/mlx5_core.sf.1":{"supported_classes":["net"], \
  "max_supported_vqs":257,"dev_features":["CSUM","GUEST_CSUM","MTU", \
  "HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ","MQ","CTRL_MAC_ADDR", \
  "VERSION_1","ACCESS_PLATFORM"]}}}

$ vdpa -jp mgmtdev show
{
    "mgmtdev": {
        "auxiliary/mlx5_core.sf.1": {
            "supported_classes": [ "net" ],
            "max_supported_vqs": 257,
            "dev_features": ["CSUM","GUEST_CSUM","MTU","HOST_TSO4", \
                             "HOST_TSO6","STATUS","CTRL_VQ","MQ", \
                             "CTRL_MAC_ADDR","VERSION_1","ACCESS_PLATFORM"]
        }
    }
}

Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220105114646.577224-11-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com>
This commit is contained in:
Eli Cohen 2022-01-05 13:46:42 +02:00 committed by Michael S. Tsirkin
parent 37e07e7058
commit cd2629f6df
3 changed files with 14 additions and 0 deletions
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10
drivers/vdpa/vdpa.c
View File

@ -514,6 +514,16 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
err = -EMSGSIZE;
goto msg_err;
}
if (nla_put_u32(msg, VDPA_ATTR_DEV_MGMTDEV_MAX_VQS,
mdev->max_supported_vqs)) {
err = -EMSGSIZE;
goto msg_err;
}
if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_SUPPORTED_FEATURES,
mdev->supported_features, VDPA_ATTR_PAD)) {
err = -EMSGSIZE;
goto msg_err;
}
genlmsg_end(msg, hdr);
return 0;

2
include/linux/vdpa.h
View File

@ -460,6 +460,8 @@ struct vdpa_mgmt_dev {
const struct virtio_device_id *id_table;
u64 config_attr_mask;
struct list_head list;
u64 supported_features;
u32 max_supported_vqs;
};
int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev);

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

@ -44,6 +44,8 @@ enum vdpa_attr {
VDPA_ATTR_DEV_NET_CFG_MTU, /* u16 */
VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, /* u32 */
VDPA_ATTR_DEV_SUPPORTED_FEATURES, /* u64 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,
};