Differentiating blade destination and traffic types in a multi-root PCIe environment

• US 8,144,582 B2
• Filed: 12/30/2008
• Issued: 03/27/2012
• Est. Priority Date: 12/30/2008
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Brown, Aaron C., Freimuth, Douglas M., Recio, Renato J., Thurber, Steven M.
• Primary Examiner(s): DIVECHA, NISHANT B
• Application Number:
  US12/346,251
• Publication Number:
  US 20100165874A1
• Time in Patent Office: 1,183 Days
• Field of Search: None
• US Class Current: 370/230.1
• CPC Class Codes: G06F 13/4022 using switching circuits, e.g. switching matrix, connection or expansion network G06F13/4009 takes precedence

Abstract

Mechanisms for differentiating traffic types per host system blade in a multi-root PCI Express environment are provided. The mechanisms generate a first mapping data structure that, for each single-root virtual hierarchy in the multi-root data processing system, associates a plurality of traffic classes with a plurality of priority groups and maps each traffic class in the plurality of traffic classes to a corresponding virtual channel in a plurality of virtual channels. Moreover, a second mapping data structure is generated that maps each virtual channel in the plurality of virtual channels to corresponding per host system blade virtual links in a plurality of virtual links of the multi-root data processing system. Traffic of a particular priority group is routed from a single-root virtual hierarchy to a particular virtual link in the plurality of the virtual links based on the first mapping data structure and second mapping data structure.

Claims

1. A method, in a data processing system, for differentiating between different traffic types comprising:

generating a first mapping data structure that, for each single-root virtual hierarchy in a plurality of single-root virtual hierarchies of the data processing system, associates each traffic class in a plurality of traffic classes with a corresponding priority group in a plurality of priority groups and a corresponding virtual channel in a plurality of virtual channels;

generating a second mapping data structure that maps each virtual channel in the plurality of virtual channels to a corresponding virtual link in a plurality of virtual links of the data processing system; and

routing traffic of a particular priority group from a single-root virtual hierarchy of the plurality of single root virtual hierarchies to a particular virtual link in the plurality of the virtual links based on the first mapping data structure and second mapping data structure, wherein each combination of a single-root virtual hierarchy of the plurality of single-root virtual hierarchy and virtual channel is mapped to a different virtual link in the plurality of virtual links, wherein routing traffic from the single-root virtual hierarchy to the particular virtual link in the plurality of the virtual links based on the first mapping data structure and second mapping data structure comprises;

determining a traffic class associated with the traffic;

performing a lookup operation in the first mapping data structure to identify a virtual channel corresponding to the particular priority group of the traffic, the priority group of the traffic corresponding to a combination of the single-root virtual hierarchy and the traffic class of the traffic;

performing a lookup operation in the second mapping data structure to identify a virtual link associated with the virtual channel and single-root virtual hierarchy of the traffic; and

routing the traffic to the identified virtual link.

2. The method of claim 1, wherein the first mapping data structure and second mapping data structure are generated by a hardware management console of the data processing system.

3. The method of claim 2, wherein the hardware management console configures one or more communication fabric managers of a host system based on the first mapping data structure and second mapping data structure.

4. The method of claim 1, wherein the data processing system is a multi-root data processing system having a plurality of single-root virtual hierarchies.

5. The method of claim 4, wherein the first mapping data structure and second mapping data structure route data from each single-root virtual hierarchy, in the plurality of single-root virtual hierarchies, to a different virtual link in the plurality of virtual links based on a combination of an identifier of the single-root virtual hierarchy and a virtual channel in a plurality of virtual channels associated with the single-root virtual hierarchy identified by the identifier.

6. The method of claim 1, wherein, for a single-root virtual hierarchy, within the first mapping data structure, a same virtual channel corresponds to a same priority group, and wherein the same virtual channel has one or more traffic classes associated with the same virtual channel.

7. The method of claim 6, wherein the single-root virtual hierarchy is associated with a host system blade of a blade server.

8. The method of claim 1, wherein the method is implemented by a Peripheral Component Interconnect (PCI) Express management component of a host system blade in a blade server.

9. The method of claim 8, wherein the PCI Express management component is one of a single-root PCI Express management component or a multi-root PCI Express management component.

10. A computer program product comprising a non-transitory computer recordable medium having a computer readable program recorded thereon, wherein the computer readable program, when executed on a data processing system, causes the data processing system to:

generate a first mapping data structure that, for each single-root virtual hierarchy in a plurality of single-root virtual hierarchies of the data processing system, associates each traffic class in a plurality of traffic classes with a corresponding priority group in a plurality of priority groups and a corresponding virtual channel in a plurality of virtual channels;

generate a second mapping data structure that maps each virtual channel in the plurality of virtual channels to a corresponding virtual link in a plurality of virtual links of the data processing system; and

route traffic of a particular priority group from a single-root virtual hierarchy of the plurality of single root virtual hierarchies to a particular virtual link in the plurality of the virtual links based on the first mapping data structure and second mapping data structure, wherein each combination of a single-root virtual hierarchy of the plurality of single-root virtual hierarchy and virtual channel is mapped to a different virtual link in the plurality of virtual links, wherein routing traffic from the single-root virtual hierarchy to the particular virtual link in the plurality of the virtual links based on the first mapping data structure and second mapping data structure comprises;

determining a traffic class associated with the traffic;

performing a lookup operation in the first mapping data structure to identify a virtual channel corresponding to the particular priority group of the traffic, the priority group of the traffic corresponding to a combination of the single-root virtual hierarchy and the traffic class of the traffic;

performing a lookup operation in the second mapping data structure to identify a virtual link associated with the virtual channel and single-root virtual hierarchy of the traffic; and

routing the traffic to the identified virtual link.

11. The computer program product of claim 10, wherein the first mapping data structure and second mapping data structure are generated by a hardware management console of the data processing system.

12. The computer program product of claim 11, wherein the hardware management console configures one or more communication fabric managers of a host system based on the first mapping data structure and second mapping data structure.

13. The computer program product of claim 10, wherein the data processing system is a multi-root data processing system having a plurality of single-root virtual hierarchies.

14. The computer program product of claim 13, wherein the first mapping data structure and second mapping data structure route data from each single-root virtual hierarchy, in the plurality of single-root virtual hierarchies, to a different virtual link in the plurality of virtual links based on a combination of an identifier of the single-root virtual hierarchy and a virtual channel in a plurality of virtual channels associated with the single-root virtual hierarchy identified by the identifier.

15. The computer program product of claim 10, wherein, for a single-root virtual hierarchy, within the first mapping data structure, a same virtual channel corresponds to a same priority group, and wherein the same virtual channel has one or more traffic classes associated with the same virtual channel.

16. The computer program product of claim 15, wherein the single-root virtual hierarchy is associated with a host system blade of a blade server.

17. The computer program product of claim 10, wherein the computer readable program is executed in a Peripheral Component Interconnect (PCI) Express management component of a host system blade of a blade server.

18. A data processing system, comprising:

a hardware management console; and

a host system coupled to the hardware management console, wherein the hardware management console;

generates a first mapping data structure that, for each single-root virtual hierarchy in a plurality of single-root virtual hierarchies of the data processing system, associates each traffic class in a plurality of traffic classes with a corresponding priority group in a plurality of priority groups and a corresponding virtual channel in a plurality of virtual channels;

generates a second mapping data structure that maps each virtual channel in the plurality of virtual channels to a corresponding virtual link in a plurality of virtual links of the data processing system; and

routes traffic of a particular priority group from a single-root virtual hierarchy of the plurality of single root virtual hierarchies to a particular virtual link in the plurality of the virtual links based on the first mapping data structure and second mapping data structure, wherein each combination of a single-root virtual hierarchy of the plurality of single-root virtual hierarchy and virtual channel is mapped to a different virtual link in the plurality of virtual links, wherein routing traffic from the single-root virtual hierarchy to the particular virtual link in the plurality of the virtual links based on the first mapping data structure and second mapping data structure comprises;

determining a traffic class associated with the traffic;

performing a lookup operation in the first mapping data structure to identify a virtual channel corresponding to the particular priority group of the traffic, the priority group of the traffic corresponding to a combination of the single-root virtual hierarchy and the traffic class of the traffic;

performing a lookup operation in the second mapping data structure to identify a virtual link associated with the virtual channel and single-root virtual hierarchy of the traffic; and

routing the traffic to the identified virtual link.