Support querying and resetting to default param values. Introduce two new devlink netlink attrs: DEVLINK_ATTR_PARAM_VALUE_DEFAULT and DEVLINK_ATTR_PARAM_RESET_DEFAULT. The former is used to contain an optional parameter value inside of the param_value nested attribute. The latter is used in param-set requests from userspace to indicate that the driver should reset the param to its default value. To implement this, two new functions are added to the devlink driver api: devlink_param::get_default() and devlink_param::reset_default(). These callbacks allow drivers to implement default param actions for runtime and permanent cmodes. For driverinit params, the core latches the last value set by a driver via devl_param_driverinit_value_set(), and uses that as the default value for a param. Because default parameter values are optional, it would be impossible to discern whether or not a param of type bool has default value of false or not provided if the default value is encoded using a netlink flag type. For this reason, when a DEVLINK_PARAM_TYPE_BOOL has an associated default value, the default value is encoded using a u8 type.
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| @@ -639,6 +639,9 @@ enum devlink_attr { · 638 unmodified lines | |||
| 639 | 639 | ||
| 640 | DEVLINK_ATTR_HEALTH_REPORTER_BURST_PERIOD, /* u64 */ | 640 | DEVLINK_ATTR_HEALTH_REPORTER_BURST_PERIOD, /* u64 */ |
| 641 | 641 | ||
| 642 | DEVLINK_ATTR_PARAM_VALUE_DEFAULT, /* dynamic */ | ||
| 643 | DEVLINK_ATTR_PARAM_RESET_DEFAULT, /* flag */ | ||
| 644 | |||
| 642 | /* Add new attributes above here, update the spec in | 645 | /* Add new attributes above here, update the spec in |
| 643 | * Documentation/netlink/specs/devlink.yaml and re-generate | 646 | * Documentation/netlink/specs/devlink.yaml and re-generate |
| 644 | * net/devlink/netlink_gen.c. | 647 | * net/devlink/netlink_gen.c. |