Switching device, peripheral component interconnect express system, and method for initializing peripheral component interconnect express system

A Peripheral Component Interconnect Express (PCIe) system comprising:

• a host comprising a management baseboard management controller (BMC), wherein the management BMC comprises a configuration management function;
• an input/output (I/O) device;
• and
• a switching device comprising:
• Peripheral Component Interconnect Express (PCIe) upstream ports configured to couple to the host;
• a PCIe downstream port coupled to the PCIe upstream ports and configured to couple to the I/O device;
• an internal connection line;
• and
• an internal processing apparatus coupled to the PCIe downstream port using the internal connection line and configured to:
• transmit a configuration read/write packet to the PCIe downstream port using the internal connection line,
• receive, from the PCIe downstream port, in response to the configuration read/write packet, and using the internal connection line, a configuration read/write response packet comprising a completer identification, and
• determine, according to the completer identification, that the switching device is coupled to the I/O device whose identification is the completer identification.

A method for initializing a Peripheral Component Interconnect Express (PCIe) system, implemented by the PCIe system, and comprising:

• sending, by a management baseboard management controller (BMC) in a host to an internal processing apparatus in a switching device, an initialization instruction;
• determining, by the internal processing apparatus according to the initialization instruction, a first input/output (I/O) device connected to the switching device;
• reporting, to the management BMC, first information about the first I/O device;
• obtaining, by the host, second information about a second I/O device connected to the host;
• and
• loading, by the host according to the second information, a virtual function drive and a physical function drive of the second I/O device.