ethernetif.c / ethernetif.h /* * This file is a skeleton for developing Ethernet network interface * drivers for lwIP. Add code to the low_level functions and do a * search-and-replace for the word “ethernetif” to replace it with * something that better describes your network interface. */
为lwip提供访问以太网的API，包括对MAC(硬件)收发数据包，初始化接口描述符
API： err_t ethernetif_init(struct netif *netif) err_t ethernetif_input(struct netif *netif)