Tue, Nov 01, 2022 at 05:18:34PM CET, kuba@xxxxxxxxxx wrote:
>On Mon, 31 Oct 2022 13:42:48 +0100 Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@xxxxxxxxxx>
>>
>> Expose devlink port handle related to netdev over rtnetlink. Introduce a
>> new nested IFLA attribute to carry the info. Call into devlink code to
>> fill-up the nest with existing devlink attributes that are used over
>> devlink netlink.
>
>> +int devlink_nl_port_handle_fill(struct sk_buff *msg, struct devlink_port *devlink_port)
>> +{
>> + if (devlink_nl_put_handle(msg, devlink_port->devlink))
>> + return -EMSGSIZE;
>> + if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, devlink_port->index))
>> + return -EMSGSIZE;
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_nl_port_handle_fill);
>> +
>> +size_t devlink_nl_port_handle_size(struct devlink_port *devlink_port)
>> +{
>> + struct devlink *devlink = devlink_port->devlink;
>> +
>> + return nla_total_size(strlen(devlink->dev->bus->name) + 1) /* DEVLINK_ATTR_BUS_NAME */
>> + + nla_total_size(strlen(dev_name(devlink->dev)) + 1) /* DEVLINK_ATTR_DEV_NAME */
>> + + nla_total_size(4); /* DEVLINK_ATTR_PORT_INDEX */
>> +}
>> +EXPORT_SYMBOL_GPL(devlink_nl_port_handle_size);
>
>Why the exports? devlink is a boolean now IIRC.
Right, removed.
>
>> +static int rtnl_fill_devlink_port(struct sk_buff *skb,
>> + const struct net_device *dev)
>> +{
>> + struct nlattr *devlink_port_nest;
>> + int ret;
>> +
>> + devlink_port_nest = nla_nest_start(skb, IFLA_DEVLINK_PORT);
>> + if (!devlink_port_nest)
>> + return -EMSGSIZE;
>> +
>> + if (dev->devlink_port) {
>
>Why produce the empty nest if port is not set?
Empty nest indicates that kernel supports this but there is no devlink
port associated. I see no other way to indicate this :/
>
>> + ret = devlink_nl_port_handle_fill(skb, dev->devlink_port);
>> + if (ret < 0)
>> + goto nest_cancel;
>> + }
>> +
>> + nla_nest_end(skb, devlink_port_nest);
>> + return 0;
>> +
>> +nest_cancel:
>> + nla_nest_cancel(skb, devlink_port_nest);
>> + return ret;
>> +}
