Research and Implementation of DMA Based on SR-IOV

With the development of cloud computing, container cloud, and other technologies, CPU and memory virtualization becomes more mature. Since the performance of I/O virtualization affects the overall operational efficiency of the system, improving I/O performance and the utilization of transmission bandwidth of devices is the focus of virtualization technology research. Based on the theoretical research of Single Root I/O Virtualization (SR-IOV) technology, this paper designs and implements a Direct Memory Access(DMA) interaction architecture based on SR-IOV virtualization devices using Field Programmable Gate Array (FPGA), which solves the need for high-speed data transmission between cloud computing platforms and virtual devices. This architecture adopts the processing method of independent virtual device management descriptors and shared data movers, ensuring independent operation between virtual devices and reducing the resource utilization rate of the design. Firstly, the chain structure is employed flexibly and efficiently to achieve descriptor management. In the meantime, it also reduces the pressure of interrupts on the CPU. Secondly, the data mover implementation framework adopts asynchronous pipelining mode, with extremely high transmission performance. After testing and verification, the interactive architecture can achieve high-speed data communication, with read and write bandwidth utilization rates of up to 87% and 79%, respectively. At the same time, this architecture can balance the bandwidth allocation among virtual devices.