netifd [2] - device

数据结构

/** * 设备类型对象，不同设备定义自己的类型处理函数 */struct device_type {    struct list_head list;    const char *name;    const struct uci_blob_param_list *config_params;    struct device *(*create)(const char *name, struct blob_attr *attr);    void (*config_init)(struct device *);    enum dev_change_type (*reload)(struct device *, struct blob_attr *);    void (*dump_info)(struct device *, struct blob_buf *buf);    void (*dump_stats)(struct device *, struct blob_buf *buf);    int (*check_state)(struct device *);    void (*free)(struct device *);};

enum device_event {    DEV_EVENT_ADD,    DEV_EVENT_REMOVE,    DEV_EVENT_UPDATE_IFNAME,    DEV_EVENT_UPDATE_IFINDEX,    DEV_EVENT_SETUP,    DEV_EVENT_TEARDOWN,    DEV_EVENT_UP,    DEV_EVENT_DOWN,    DEV_EVENT_LINK_UP,    DEV_EVENT_LINK_DOWN,    /* Topology changed (i.e. bridge member added) */    DEV_EVENT_TOPO_CHANGE,    __DEV_EVENT_MAX};struct device_user {    struct safe_list list;    bool claimed;    bool hotplug;    bool alias;    uint8_t ev_idx[__DEV_EVENT_MAX];    struct device *dev;  /** 引用指向的dev */    void (*cb)(struct device_user *, enum device_event); /** 事件处理回调函数 */};

/** * 设备配置对象中已存在的配置 */enum {    DEV_OPT_MTU     = (1 << 0),    DEV_OPT_MACADDR     = (1 << 1),    DEV_OPT_TXQUEUELEN  = (1 << 2),    DEV_OPT_IPV6        = (1 << 3),};/** * 设备配置对象 */struct device_settings {    unsigned int flags;    unsigned int mtu;    unsigned int txqueuelen;    uint8_t macaddr[6];    bool ipv6;};

struct device {    const struct device_type *type;    struct avl_node avl;    struct safe_list users;    struct safe_list aliases;    char ifname[IFNAMSIZ + 1];    int ifindex;    struct blob_attr *config;    bool config_pending;    bool sys_present;    bool present;    int active;    bool link_active;    bool external;    bool disabled;    bool deferred;    bool hidden;    bool current_config;   /** 当前配置是否有效 */    bool default_config;    /* set interface up or down */    device_state_cb set_state;    const struct device_hotplug_ops *hotplug_ops;    struct device_user parent;    struct device_settings orig_settings;    struct device_settings settings;};struct device_hotplug_ops {    int (*prepare)(struct device *dev);    int (*add)(struct device *main, struct device *member);    int (*del)(struct device *main, struct device *member);};

接口说明

初始/销毁

/** * 初始化链表dev->users dev->aliases */void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)/** * 以dev->ifname为key值加入全局AVL devices二叉树 * 清除dev所有相关接口信息 */int device_init(struct device *iface, const struct device_type *type, const char *ifname)

/** * 清除dev所有引用dev->users dev->aliases * 把dev从全局AVL devices二叉树中删除 */void device_cleanup(struct device *dev)

创建

/** * 根据dev_type和config创建新dev */struct device *device_create(const char *name, const struct device_type *type,                 struct blob_attr *config)

引用

/** * 增加新user到dev */void device_add_user(struct device_user *dep, struct device *iface)/** * 删除dev user */void device_remove_user(struct device_user *dep)

/** * 引用加1 */int device_claim(struct device_user *dep)/** * 引用减1 */void device_release(struct device_user *dep)

状态

void device_dump_status(struct blob_buf *b, struct device *dev)