SWITCH, INFORMATION PROCESSING APPARATUS, AND COMMUNICATION CONTROL METHOD

• US 20130259053A1
• Filed: 12/20/2012
• Published: 10/03/2013
• Est. Priority Date: 03/29/2012
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: SATO, Mitsuru
• Granted Patent: US 9,219,695 B2
• Time in Patent Office: Days
• US Class Current: 370/400
• CPC Class Codes: G06F 13/382 using universal interface adapter
• CPC Class Codes: G06F 3/00 Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
• CPC Class Codes: H04L 49/15 Interconnection of switching modules
• CPC Class Codes: H04L 49/25 Routing or path finding in a switch fabric
• CPC Class Codes: H04L 49/3009 Header conversion, routing tables or routing tags

Abstract

A PCIe switch stores therein a first identifier used by a CPU to identify a device, a second identifier that is a common identifier to identify the device in a network formed among a plurality of switches that connect the CPU to the device, and a destination of an access request to the device in an associated manner. When having received an access request from the CPU, the PCIe switch identifies a second identifier and a destination that are associated with a first identifier included in the access request. After that, the PCIe switch adds the identified second identifier to the access request, and transmits the access request with the second identifier added to the identified destination.

Claims

1. A switch comprising:

a storage unit that stores therein a first identifier used by a processor to identify a device, a second identifier that is a common identifier to identify the device in a network formed among a plurality of switches that connect the processor to the device, and a destination of an access request to the device in an associated manner;

an identifying unit that identifies, when the switch has received an access request from the processor, a second identifier and a destination that are associated with a first identifier included in the access request from the storage unit; and

a transmission control unit that adds the second identifier identified by the identifying unit to the access request, and transmits the access request with the second identifier to the destination identified by the identifying unit.

2. The switch according to claim 1, wherein

when the destination identified by the identifying unit is another switch, the transmission control unit transmits the access request with the second identifier, and

when the destination identified by the identifying unit is a device, the transmission control unit deletes the second identifier from the access request and transmits the access request with no second identifier.

3. The switch according to claim 1, wherein

when a second identifier is included in an access request received from another switch, the identifying unit identifies a destination associated with the second identifier from the storage unit, and

the transmission control unit transmits the received access request to the destination identified by the identifying unit.

4. The switch according to claim 1, further comprising a change control unit that changes, when the switch has received an instruction to change a destination stored in the storage unit from a management server that manages the switch, the destination stored in the storage unit to specified content.

5. The switch according to claim 1, wherein

the storage unit stores therein the first identifier used by the processor that accesses the device using PCI Express, the second identifier, and the destination in an associated manner, and

the transmission control unit writes the second identifier identified by the identifying unit in a TLP prefix area of the PCI Express in an access request transmitted from the processor using the PCI Express, and transmits the access request with the second identifier to the destination identified by the identifying unit.

6. An information processing apparatus comprising:

a storage unit that stores therein a first identifier used by a processor to identify a device, a second identifier that is a common identifier to identify the device in a network formed among a plurality of switches that connect the processor to the device, and a destination of an access request to the device in an associated manner;

an identifying unit that identifies, when the switch has received an access request from the processor, a second identifier and a destination that are associated with a first identifier included in the access request from the storage unit; and

a transmission control unit that adds the second identifier identified by the identifying unit to the access request, and transmits the access request with the second identifier to the destination identified by the identifying unit.

7. A communication control method comprising:

receiving an access request from a processor;

identifying a second identifier and a destination that are associated with a first identifier included in the access request with reference to a storage unit that stores therein a first identifier used by the processor to identify a device, a second identifier that is a common identifier to identify the device in a network formed among a plurality of switches that connect the processor to the device, and a destination of an access request to the device in an associated manner; and

adding the identified second identifier to the access request and transmitting the access request with the second identifier added to the identified destination.