Virtualized peripheral component interconnect express (PCIe) device

A method for operating a programmable integrated circuit, the method comprising:

• determining, by a classifier circuit on the programmable integrated circuit, whether a received Peripheral Component Interconnect Express (PCIe) message is a PCIe Type 1 configuration transaction or a non-PCIe Type 1 configuration transaction;
• forwarding the received PCIe message from the classifier circuit to an endpoint device of one or more endpoint devices on one or more programmable logic regions of the programmable integrated circuit when the received PCIe message is the non-PCIe Type 1 configuration transaction;
• forwarding the received PCIe message from the classifier circuit to a message trap engine circuit when the received PCIe message is the PCIe Type 1 configuration transaction, the message trap engine circuit virtualizing one or more downstream ports of a virtual switch, the message trap engine circuit maintaining:
• a respective configuration space of each endpoint device of the one or more endpoint devices;
• and
• a respective configuration space of each downstream port of the one or more downstream ports;
• and
• accessing, by the message trap engine circuit, the configuration space of a respective downstream port or a respective endpoint device when the received PCIe message targets the respective downstream port of the one or more downstream ports or the respective endpoint device of the one or more endpoint devices, respectively.

A device comprising:

• a programmable integrated circuit comprising:
• a classifier circuit capable of receiving a Peripheral Component Interconnect Express (PCIe) message and configured to determine whether the PCIe message is a PCIe Type 1 configuration transaction or is a non-PCIe Type 1 configuration transaction, the classifier circuit further being configured to forward the PCIe message to an endpoint device of one or more endpoint devices in one or more programmable logic regions of the programmable integrated circuit when the PCIe message is the non-PCIe Type 1 configuration transaction;
• a message trap engine circuit, the classifier circuit further being configured to forward the PCIe message to the message trap engine circuit when the PCIe message is the PCIe Type 1 configuration transaction, the message trap engine circuit being configured to virtualize one or more downstream ports of a virtual switch;
• and
• a respective configuration space of each downstream port of the one or more downstream ports maintained by the message trap engine circuit;
• and
• a respective configuration space of each endpoint device of the one or more endpoint devices maintained by the message trap engine circuit, the message trap engine circuit being capable of accessing the configuration space of a respective endpoint device or a respective downstream port in response to the PCIe message targeting the respective endpoint device of the one or more endpoint devices or the respective downstream port of the one or more downstream ports, respectively.