projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| cb8a14b2 BG |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* | |
| 3 | * This file contains all networking devres helpers. | |
| 4 | */ | |
| 5 | ||
| 6 | #include <linux/device.h> | |
| 7 | #include <linux/etherdevice.h> | |
| 8 | #include <linux/netdevice.h> | |
| 9 | ||
| f75063ab BG |
10 | struct net_device_devres { |
| 11 | struct net_device *ndev; | |
| 12 | }; | |
| 13 | ||
| 14 | static void devm_free_netdev(struct device *dev, void *this) | |
| cb8a14b2 | 15 | { |
| f75063ab BG |
16 | struct net_device_devres *res = this; |
| 17 | ||
| 18 | free_netdev(res->ndev); | |
| cb8a14b2 BG |
19 | } |
| 20 | ||
| 21 | struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv, | |
| 22 | unsigned int txqs, unsigned int rxqs) | |
| 23 | { | |
| f75063ab | 24 | struct net_device_devres *dr; |
| cb8a14b2 BG |
25 | |
| 26 | dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL); | |
| 27 | if (!dr) | |
| 28 | return NULL; | |
| 29 | ||
| f75063ab BG |
30 | dr->ndev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs); |
| 31 | if (!dr->ndev) { | |
| cb8a14b2 BG |
32 | devres_free(dr); |
| 33 | return NULL; | |
| 34 | } | |
| 35 | ||
| cb8a14b2 BG |
36 | devres_add(dev, dr); |
| 37 | ||
| f75063ab | 38 | return dr->ndev; |
| cb8a14b2 BG |
39 | } |
| 40 | EXPORT_SYMBOL(devm_alloc_etherdev_mqs); | |
| cd16627f | 41 | |
| fe189519 | 42 | static void devm_unregister_netdev(struct device *dev, void *this) |
| cd16627f BG |
43 | { |
| 44 | struct net_device_devres *res = this; | |
| 45 | ||
| 46 | unregister_netdev(res->ndev); | |
| 47 | } | |
| 48 | ||
| 49 | static int netdev_devres_match(struct device *dev, void *this, void *match_data) | |
| 50 | { | |
| 51 | struct net_device_devres *res = this; | |
| 52 | struct net_device *ndev = match_data; | |
| 53 | ||
| 54 | return ndev == res->ndev; | |
| 55 | } | |
| 56 | ||
| 57 | /** | |
| 58 | * devm_register_netdev - resource managed variant of register_netdev() | |
| 59 | * @dev: managing device for this netdev - usually the parent device | |
| 60 | * @ndev: device to register | |
| 61 | * | |
| 62 | * This is a devres variant of register_netdev() for which the unregister | |
| 63 | * function will be call automatically when the managing device is | |
| 64 | * detached. Note: the net_device used must also be resource managed by | |
| 65 | * the same struct device. | |
| 66 | */ | |
| 67 | int devm_register_netdev(struct device *dev, struct net_device *ndev) | |
| 68 | { | |
| 69 | struct net_device_devres *dr; | |
| 70 | int ret; | |
| 71 | ||
| 72 | /* struct net_device must itself be managed. For now a managed netdev | |
| 73 | * can only be allocated by devm_alloc_etherdev_mqs() so the check is | |
| 74 | * straightforward. | |
| 75 | */ | |
| 76 | if (WARN_ON(!devres_find(dev, devm_free_netdev, | |
| 77 | netdev_devres_match, ndev))) | |
| 78 | return -EINVAL; | |
| 79 | ||
| fe189519 | 80 | dr = devres_alloc(devm_unregister_netdev, sizeof(*dr), GFP_KERNEL); |
| cd16627f BG |
81 | if (!dr) |
| 82 | return -ENOMEM; | |
| 83 | ||
| 84 | ret = register_netdev(ndev); | |
| 85 | if (ret) { | |
| 86 | devres_free(dr); | |
| 87 | return ret; | |
| 88 | } | |
| 89 | ||
| 90 | dr->ndev = ndev; | |
| 91 | devres_add(ndev->dev.parent, dr); | |
| 92 | ||
| 93 | return 0; | |
| 94 | } | |
| 95 | EXPORT_SYMBOL(devm_register_netdev); |