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