Data processing method and device, and server

A server, the server comprising a device, the device is connected to the server through a high-speed serial computer expansion standard (PCIe) bus, and the device is configured to perform the following operation steps:

• obtaining a first input/output (I/O) request sent by a virtual machine, wherein the device is connected to the server through a PCIe bus, the virtual machine runs on the server, the device provides a plurality of virtual functions (VFs) for the server, the first I/O request is initiated by the virtual machine for any one VF of the plurality of VFs, and the VF is used to manage storage space of the virtual machine;
• and
• reading or writing data from or into the I/O device in the server based on the first I/O request;
• obtaining a first descriptor from a first queue, wherein the first descriptor is generated after a front-end driver in the virtual machine processes the first I/O request, the first descriptor is used to indicate a storage location of the first I/O request in a memory of the server, the first queue is stored in the memory of the server, and the first queue is used to store descriptors of a plurality of I/O requests comprising the first I/O request;
• and
• obtaining the first I/O request from the memory of the server based on the first descriptor;
• wherein the device comprises a descriptor prefetch engine and a direct memory access (DMA) engine,
• the descriptor prefetch engine is configured to generate a second descriptor, and send the second descriptor to the DMA engine, wherein the second descriptor is used to indicate a storage location of the first descriptor in the storage space allocated by the server to the first queue;
• and
• the DMA engine is configured to obtain the first descriptor from the first queue in a DMA manner based on the second descriptor, and store the first descriptor in the memory of the device.

A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to carry out steps for:

• obtaining a first input/output (I/O) request sent by a virtual machine, wherein the device is connected to the server through a peripheral component interconnect express (PCIe) bus, the virtual machine runs on the server, the device provides a plurality of virtual functions (VFs) for the server, the first I/O request is initiated by the virtual machine for any one VF of the plurality of VFs, and the VF is used to manage storage space of the virtual machine;
• and
• reading or writing data from or into the I/O device in the server based on the first I/O request;
• obtaining a first descriptor from a first queue, wherein the first descriptor is generated after a front-end driver in the virtual machine processes the first I/O request, the first descriptor is used to indicate a storage location of the first I/O request in a memory of the server, the first queue is stored in the memory of the server, and the first queue is used to store descriptors of a plurality of I/O requests comprising the first I/O request;
• and
• obtaining the first I/O request from the memory of the server based on the first descriptor;
• wherein the device comprises a descriptor prefetch engine and a direct memory access (DMA) engine,
• the descriptor prefetch engine is configured to generate a second descriptor, and send the second descriptor to the DMA engine, wherein the second descriptor is used to indicate a storage location of the first descriptor in the storage space allocated by the server to the first queue;
• and
• the DMA engine is configured to obtain the first descriptor from the first queue in a DMA manner based on the second descriptor, and store the first descriptor in the memory of the device.