Communication between target-side data interface device and host-side data interface device

A host-side data interface device comprising:

• a plurality of downstream ports, each of the plurality of downstream ports assigned to a respective group of data end points (EPs) of a plurality of data EPs, and each of the plurality of downstream ports configured to send communications to the respective group of data EPs via a respective communication link to a target-side data interface device;
• a plurality of link controllers, each of the plurality of link controllers coupled to a respective downstream port of the plurality of downstream ports;
• and
• a plurality of interface controllers, each of the plurality of interface controllers coupled to a respective link controller of the plurality of link controllers,
• wherein a first interface controller of the plurality of interface controllers is configured to:
• receive a notification of an input/output (I/O) message associated with a data channel, the I/O message addressed to a first device;
• and
• based on a determination that the first device is coupled to a first data EP of the plurality of data EPs and that the first data EP is assigned to a first downstream port of the plurality of downstream ports, send an I/O request via a first link controller to the first downstream port.

A host-side data interface device comprising:

• a downstream port configured to be coupled via a communication link to a target-side data interface device;
• and
• an interrupt controller coupled to the downstream port and to an interface controller, the interrupt controller configured to:
• receive an interrupt message from the downstream port, the interrupt message indicating an interrupt end point (EP) identifier of an interrupt EP, a data EP identifier of a data EP, and an input/output (I/O) status, the I/O status corresponding to an interrupt associated with an I/O operation of a first device;
• and
• based on a determination that the interrupt message includes the interrupt EP identifier, provide the data EP identifier and the I/O status to the interface controller.