https://www.kernel.org/doc/Documentation/networking/can.txt
中文版本:https://www.cnblogs.com/eaggle/p/7641406.html
http://blog.sina.com.cn/s/blog_4567bb800101bntd.html
https://blog.csdn.net/lybhit/article/details/78663347
canfd:https://stackoverflow.com/questions/36568167/can-fd-support-for-virtual-can-vcan-on-socketcan
ip link set can0 mtu 72