The new 8-byte DIF field includes a cyclical redundancy code (CRC) to protect the data, a reference tag to protect against misdirected writes, and an application tag.
这个新的8字节dif字段包括一个循环冗余代码(CRC)用以保护数据，一个参考标签用以保护数据免遭误导写入，以及一个应用程序标签。
For items that have two paths to send, there is a null byte after the first path, and it is followed by the second path, with the pathlen field of the message being set to the total length.
对于有两个路径需要发送的项，那么在第一个路径之后有一个null字节，其后紧跟第二个路径，并且消息的pathlen字段被设置为总长度。
一个1字节的选择符域。
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