code: func DecodeRxBufferHeader(b []byte) RxBuffer {
  	return RxBuffer{
  		Offset:   binary.LittleEndian.Uint64(b[postedOffset:]),
  		Size:     binary.LittleEndian.Uint32(b[postedSize:]),
  		ID:       binary.LittleEndian.Uint64(b[postedID:]),
  		UserData: binary.LittleEndian.Uint64(b[postedUserData:]),
  	}
  }
docs: // DecodeRxBufferHeader decodes the header of a buffer posted on an rx queue.