96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* This file contains all networking devres helpers.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/netdevice.h>
|
|
|
|
struct net_device_devres {
|
|
struct net_device *ndev;
|
|
};
|
|
|
|
static void devm_free_netdev(struct device *dev, void *this)
|
|
{
|
|
struct net_device_devres *res = this;
|
|
|
|
free_netdev(res->ndev);
|
|
}
|
|
|
|
struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
|
|
unsigned int txqs, unsigned int rxqs)
|
|
{
|
|
struct net_device_devres *dr;
|
|
|
|
dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
|
|
if (!dr)
|
|
return NULL;
|
|
|
|
dr->ndev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
|
|
if (!dr->ndev) {
|
|
devres_free(dr);
|
|
return NULL;
|
|
}
|
|
|
|
devres_add(dev, dr);
|
|
|
|
return dr->ndev;
|
|
}
|
|
EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
|
|
|
|
static void devm_netdev_release(struct device *dev, void *this)
|
|
{
|
|
struct net_device_devres *res = this;
|
|
|
|
unregister_netdev(res->ndev);
|
|
}
|
|
|
|
static int netdev_devres_match(struct device *dev, void *this, void *match_data)
|
|
{
|
|
struct net_device_devres *res = this;
|
|
struct net_device *ndev = match_data;
|
|
|
|
return ndev == res->ndev;
|
|
}
|
|
|
|
/**
|
|
* devm_register_netdev - resource managed variant of register_netdev()
|
|
* @dev: managing device for this netdev - usually the parent device
|
|
* @ndev: device to register
|
|
*
|
|
* This is a devres variant of register_netdev() for which the unregister
|
|
* function will be call automatically when the managing device is
|
|
* detached. Note: the net_device used must also be resource managed by
|
|
* the same struct device.
|
|
*/
|
|
int devm_register_netdev(struct device *dev, struct net_device *ndev)
|
|
{
|
|
struct net_device_devres *dr;
|
|
int ret;
|
|
|
|
/* struct net_device must itself be managed. For now a managed netdev
|
|
* can only be allocated by devm_alloc_etherdev_mqs() so the check is
|
|
* straightforward.
|
|
*/
|
|
if (WARN_ON(!devres_find(dev, devm_free_netdev,
|
|
netdev_devres_match, ndev)))
|
|
return -EINVAL;
|
|
|
|
dr = devres_alloc(devm_netdev_release, sizeof(*dr), GFP_KERNEL);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
ret = register_netdev(ndev);
|
|
if (ret) {
|
|
devres_free(dr);
|
|
return ret;
|
|
}
|
|
|
|
dr->ndev = ndev;
|
|
devres_add(ndev->dev.parent, dr);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devm_register_netdev);
|