Data transmission method, device, network system, and storage medium

A data transmission method, applied to a second processing device located on a Peripheral Component Interconnect express (PCIe) link, wherein the method comprises:

• receiving a pre-read request, which is sent by a first processing device located on the PCIe link according to a first read request, wherein the first read request is sent by a PCIe request end in a Non-Posted data transmission mode, and is used for requesting a first data segment from a PCIe destination end;
• reading, according to the pre-read request, a plurality of data segments comprising the first data segment from the PCIe destination end;
• and
• providing the plurality of data segments comprising the first data segment to the first processing device in a Posted data transmission mode.

A network system, comprising:

• a Peripheral Component Interconnect express (PCIe) request end, a PCIe destination end, and a multistage PCIe switching device connected between the PCIe request end and the PCIe destination end;
• wherein the multistage PCIe switching device at least comprises a first PCIe switching device and a second PCIe switching device;
• the first PCIe switching device is configured for receiving a first read request, which is sent by the PCIe request end in a Non-Posted data transmission mode, wherein the first read request is used for requesting a first data segment from the PCIe destination end;
• in a case where the first data segment is not hit locally, sending a pre-read request to the second PCIe switching device;
• and saving locally a plurality of data segments, comprising the first data segment, provided by the second PCIe switching device, and returning the first data segment, as response data of the first read request, to the PCIe request end;
• and
• the second PCIe switching device is configured for receiving the pre-read request, and reading, according to the pre-read request, the plurality of data segments from the PCIe destination end;
• and providing the plurality of data segments to the first PCIe switching device in a Posted data transmission mode.

A network system, comprising:

• a Peripheral Component Interconnect express (PCIe) request end, a PCIe destination end, a first transmission mode conversion device connected to the PCIe request end, a second transmission mode conversion device connected to the PCIe destination end, and a PCIe switching device connected between the first transmission mode conversion device and the second transmission mode conversion device, wherein,
• the first transmission mode conversion device is configured for receiving a first read request, which is sent by the PCIe request end in a Non-Posted data transmission mode, wherein the first read request is used for requesting a first data segment from the PCIe destination end;
• in a case where the first data segment is not hit locally, sending a pre-read request to the second transmission mode conversion device;
• and saving locally a plurality of data segments, comprising the first data segment, provided by the second transmission mode conversion device, and returning the first data segment, as response data of the first read request, to the PCIe request end;
• and
• the second transmission mode conversion device is configured for receiving the pre-read request, and reading, according to the pre-read request, the plurality of data segments from the PCIe destination end;
• and providing the plurality of data segments to the first transmission mode conversion device in a Posted data transmission mode.

A Peripheral Component Interconnect express (PCIe) switching device, implemented as a first PCIe switching device located on a PCIe link, wherein the PCIe switching device comprises:

• a memory and a processor;
• and the memory is configured for storing a computer program;
• and the processor is coupled with the memory, and is configured for executing the computer program to:
• receive a first read request, which is sent by a PCIe request end in a Non-Posted data transmission mode, wherein the first read request is used for requesting a first data segment from a PCIe destination end;
• in a case where the first data segment is not hit locally, send a pre-read request to a second PCIe switching device located on the PCIe link, to instruct the second PCIe switching device to provide, in a Posted data transmission mode in advance, a plurality of data segments of the PCIe destination end to the first PCIe switching device, wherein the plurality of data segments comprise the first data segment;
• and
• save locally the plurality of data segments provided by the second PCIe switching device, and returning the first data segment, as response data of the first read request, to the PCIe request end.

A Peripheral Component Interconnect express (PCIe) switching device, implemented as a second PCIe switching device located on a PCIe link, wherein the PCIe switching device comprises:

• a memory and a processor;
• and the memory is configured for storing a computer program;
• and the processor is coupled with the memory, and is configured for executing the computer program to:
• receive a pre-read request, which is sent by a first PCIe switching device located on the PCIe link according to a first read request, wherein the first read request is sent by a PCIe request end in a Non-Posted data transmission mode, and is used for requesting a first data segment from a PCIe destination end;
• read, according to the pre-read request, a plurality of data segments comprising the first data segment from the PCIe destination end;
• and
• provide the plurality of data segments comprising the first data segment to the first PCIe switching device in a Posted data transmission mode.