嵌入式 抓包小工具，利用raw socket 抓取从网卡中经过的所有数据包，可以通过net filter对数据包进行过滤-Gadgets embedded packet capture, using raw socket to crawl from the card in all packets through, you can net filter to filter packets

linux mdio tool: read operation: mdio reg_addr write operation: mdio reg_addr value For example: mdio eth0 1 mdio eth0 0 0x12