US 2014/0006679 A1Published application

Computer system and routing control method

AssigneeHitachi, Ltd.

InventorsShuhei Eguchi, Ryo Yamagata, Takashi Todaka

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Abstract

The present invention eliminates the shortage of bus numbers in routing control using PCIe switches. A system port address (SPA) is associated with a destination bus number and is assigned to a port (external port) connected to a server and a device. When packets sent from the server or the device are received at the external port, the system port address (SPA) corresponding to the destination bus number having the packets is determined, and the SPA is added to the packets as a label. This SPA is used to route the packets sent between ports (internal ports) that connect switches. When the packets arrive at the external port to which the target server or device is connected, the destination bus number having packets is used to send the packets to the server or device connected to the external port.

Claims15

Dependent claims

A computer system in which a server and one or a plurality of devices are connected to each other by a plurality of PCIe switches each having a plurality of ports, the computer system sending packets between the server and the device through the port of the PCIe switch,

wherein the port is an internal port which is a port connecting the PCIe switches, or an external port which is a port connected to the server or the device
wherein the external port includes:
a storage unit for storing a system port address (SPA) which is uniquely assigned to the external port in the computer system;
conversion means for managing the association between the destination bus number and the SPA;
and
SPA set setting means for setting a set of SPAs,
wherein the internal port includes a storage unit in which the SPA is not held, and SPA set setting means for setting a set of SPAs,
wherein, when the port receives a packet from the outside of the PCIe switch, if the port is an external port, the PCIe switch obtains the SPA corresponding to the destination bus number held by the packet by referring to the conversion means, adds the obtained SPA to the packet as a label, and sends the packet to the port included in the destination of the SPA by determining a set of SPAs specified by the SPA set setting means by using the SPA added to the packet,
wherein if the port is an internal port, the PCIe switch sends the packet to the port included in the destination of the SPA by determining a set of SPAs specified by the SPA set setting by using the SPA added to the packet,
wherein, when the port receives the packet from the inside of the PCIe switch, if the port is an external port, the PCIe switch removes the SPA added to the packet, and sends the packet to the server or device connected to the external port, based on the destination bus number held by the packet, and
wherein if the port is an internal port, the PCIe switch sends the packet to an internal port of another switch connected to the internal port.

8 more elements

A packet routing control method in a computer system for sending packets between a server and one or a plurality of devices by PCIe switches each having a plurality of ports,

wherein the port is an internal port which is a port for connecting PCIe switches to each other, or an external port which is a port connected to the server or the device,
wherein the external port includes:
a storage unit for storing a system port address (SPA) which is uniquely assigned to the external port in the computer system;
conversion means for managing the association between the destination bus number and the SPA;
and
SPA set setting means for setting a set of SPAs,
wherein the internal port includes a storage unit in which the SPA is not held, and SPA set setting means for setting a set of SPAs,
wherein, when the port receives a packet from the outside of the PCIe switch, if the port is an external port, the PCIe switch obtains the SPA corresponding to the destination bus number held by the packet by referring to the conversion means, adds the obtained SPA to the packet as a label, and sends the packet to the port included in the destination of the SPA by determining a set of SPAs specified by the SPA set setting means by using the SPA added to the packet,
wherein if the port is an internal port, the PCIe switch sends the packet to the port included in the destination of the SPA by determining a set of SPAs specified by the SPA set setting means by using the SPA added to the packet,
wherein, when the port receives the packet from the inside of the PCIe switch, if the port is an external port, the PCIe switch removes the SPA added to the packet, and sends the packet to the server or device connected to the external port, by using the destination bus number held by the packet, and
wherein if the port is an internal port, the PCIe switch sends the packet to an internal port of the other switch connected to the internal port.

8 more elements

Dependencies are inferred from the claim text.