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devlink: Add API to register and unregister single parameter

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Currently device configuration parameters can be registered as an array.
Due to this a constant array must be registered. A single driver
supporting multiple devices each with different device capabilities end
up registering all parameters even if it doesn't support it.

One possible workaround a driver can do is, it registers multiple single
entry arrays to overcome such limitation.

Better is to provide a API that enables driver to register/unregister a
single parameter. This also further helps in two ways.
(1) to reduce the memory of devlink_param_entry by avoiding in registering
parameters which are not supported by the device.
(2) avoid generating multiple parameter add, delete, publish, unpublish,
init value notifications for such unsupported parameters

Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parav Pandit 2021-08-10 16:24:19 +03:00 committed by David S. Miller
parent 699784f7b7
commit b40c51efef
2 changed files with 41 additions and 0 deletions
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4
include/net/devlink.h
View file

@ -1645,6 +1645,10 @@ int devlink_params_register(struct devlink *devlink,
void devlink_params_unregister(struct devlink *devlink,
const struct devlink_param *params,
size_t params_count);
int devlink_param_register(struct devlink *devlink,
const struct devlink_param *param);
void devlink_param_unregister(struct devlink *devlink,
const struct devlink_param *param);
void devlink_params_publish(struct devlink *devlink);
void devlink_params_unpublish(struct devlink *devlink);
int devlink_port_params_register(struct devlink_port *devlink_port,

37
net/core/devlink.c
View file

@ -9903,6 +9903,43 @@ void devlink_params_unregister(struct devlink *devlink,
}
EXPORT_SYMBOL_GPL(devlink_params_unregister);
/**
* devlink_param_register - register one configuration parameter
*
* @devlink: devlink
* @param: one configuration parameter
*
* Register the configuration parameter supported by the driver.
* Return: returns 0 on successful registration or error code otherwise.
*/
int devlink_param_register(struct devlink *devlink,
const struct devlink_param *param)
{
int err;
mutex_lock(&devlink->lock);
err = __devlink_param_register_one(devlink, 0, &devlink->param_list,
param, DEVLINK_CMD_PARAM_NEW);
mutex_unlock(&devlink->lock);
return err;
}
EXPORT_SYMBOL_GPL(devlink_param_register);
/**
* devlink_param_unregister - unregister one configuration parameter
* @devlink: devlink
* @param: configuration parameter to unregister
*/
void devlink_param_unregister(struct devlink *devlink,
const struct devlink_param *param)
{
mutex_lock(&devlink->lock);
devlink_param_unregister_one(devlink, 0, &devlink->param_list, param,
DEVLINK_CMD_PARAM_DEL);
mutex_unlock(&devlink->lock);
}
EXPORT_SYMBOL_GPL(devlink_param_unregister);
/**
* devlink_params_publish - publish configuration parameters
*