Integrated multi-function adapters using standard interfaces through single a access point

• US 6,408,347 B1
• Filed: 12/10/1998
• Issued: 06/18/2002
• Est. Priority Date: 12/10/1998
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Smith, David John, Yu, Frederick Kim
• Primary Examiner(s): Gaffin, Jeffrey
• Assistant Examiner(s): Perveen, Rehana
• Application Number:
  US09/209,968
• Time in Patent Office: 1,286 Days
• Field of Search: 370/465, 710/36, 710/107, 710/302, 710/103, 713/1, 713/100
• US Class Current: 710/36
• CPC Class Codes: G06F 13/387 for adaptation of different data processing systems to different peripheral devices, e.g. protocol converters for incompatible systems, open system
• CPC Class Codes: Y10S 707/99944 Object-oriented database structure

Abstract

Methods and systems are provided for communicating to multiple functions on a single adapter device over an external communications bus, where the external communications bus is configured so as to allow only a single access point to the external communications bus for each adapter device. Communications on the external communications bus are provided through the single access point to functions of a first type in the adapter device utilizing a function specific communications interface configured for communicating with functions of the first type. Communications on the external communications bus are also provided through the single access point to functions in the adapter device other than functions of the first type utilizing management capabilities of the function specific communications interface so as to provide communications with the functions of the second type without modifying the configuration of the function specific communications interface.

Claims

1. A method of communicating to multiple functions on a single adapter device over an external communications bus, wherein the external communications bus is configured so as to allow only a single access point to the external communications bus for each adapter device, the method comprising:

providing communications on the external communications bus through the single access point to functions of a first type in the adapter device utilizing a function specific communications interface configured for communicating with functions of the first type; and

providing communications on the external communications bus through the single access point to functions in the adapter device other than functions of the first type utilizing management capabilities of the function specific communications interface so as to provide communications with the functions of the second type without requiring modification of the configuration of the function specific communications interface.

2. A method according to claim 1, further comprising the steps of assigning to the functions in the adapter device other than functions of the first type an unused address of the function specific communications interface.

3. A method according to claim 2, wherein the step of providing communications on the external communications bus through the single access point to functions in the adapter device other than functions of the first type comprises providing management function communications to the unused address assigned to the other than the function of the first type.

4. A method according to claim 1, further comprising the step of re-mapping data associated with management function communications with the functions other than the functions of the first type so as to provide function specific communications with the functions other than the function of the first type.

5. A method according to claim 1, wherein the single access point comprises a Peripheral Component Interconnect (PCI) media access controller.

6. A method according to claim 5, wherein the function specific communications interface comprises an Ethernet media independent interface (MII).

7. A method according to claim 6, wherein the functions of a first type comprises physical interfaces (PHYs).

8. A method according to claim 7, wherein the functions in the adapter device other than functions of the first type comprises a hardware address filter function.

9. A method according to claim 6, wherein the functions of a first type comprises an Ethernet switch, wherein ports of the Ethernet switch communicate over the MII and wherein control of the Ethernet switch is provided over a bus other than the MII bus.

10. A method according to claim 9, wherein the functions in the adapter device other than functions of the first type comprises functions for converting communications on the bus other than the MII bus to MII communications so as to allow control of the Ethernet switch from the PCI bus through the MAC.

31. A computer readable media, comprising:

the computer readable media containing instruction for execution in a processor for the practice of the method of claim 1.

32. Electromagnetic signals propagating on a computer network, comprising:

the electromagnetic signals carrying instructions for execution on a processor for the practice of the method of claim 1.

11. A system for communicating to multiple functions on a single adapter device over an external communications bus, wherein the external communications bus is configured so as to allow only a single access point to the external communications bus for each adapter device, comprising:

means for providing communications on the external communications bus through the single access point to functions of a first type in the adapter device utilizing a function specific communications interface configured for communicating with functions of the first type; and

means for providing communications on the external communications bus through the single access point to functions in the adapter device other than functions of the first type utilizing management capabilities of the function specific communications interface so as to provide communications with the functions of the second type without modifying the configuration of the function specific communications interface.

12. A system according to claim 11, further comprising means for assigning to the functions in the adapter device other than functions of the first type an unused address of the function specific communications interface.

13. A system according to claim 12, wherein the means for providing communications on the external communications bus through the single access point to functions in the adapter device other than functions of the first type comprises means for providing management function communications to the unused address assigned to functions other than the first type.

14. A system according to claim 11, further comprising means for re-mapping data associated with management function communications with the functions other than the functions of the first type so as to provide function specific communications with the functions other than the function of the first type.

15. A system according to claim 11, wherein the single access point comprises a Peripheral Component Interconnect (PCI) media access controller.

16. A system according to claim 15, wherein the function specific communications interface comprises an Ethernet media independent interface (MII).

17. A system according to claim 16, wherein the functions of a first type comprise physical interfaces (PHYs).

18. A system according to claim 17, wherein the functions in the adapter device other than functions of the first type comprises a hardware address filter function.

19. A system according to claim 16, wherein the functions of a first type comprises an Ethernet switch, wherein ports of the Ethernet switch communicate over the MII and wherein control of the Ethernet switch is provided over a bus other than the MII bus.

20. A system according to claim 19, wherein the functions in the adapter device other than functions of the first type comprises functions for converting communications on the bus other than the MII bus to MII communications so as to allow control of the Ethernet switch from the PCI bus through the MAC.

21. A multi-function adapter device comprising:

a controller which provides a single access point to an external communications bus;

at least one function of a first type;

an internal function specific communications interface, the interface configured to provided communication between functions of the first type and the external communications bus through the controller; and

at least one function of a second type, each function of the second type configured to utilize management capabilities of the function specific communications interface so as to provide communications without requiring modification of the function specific communications interface.

22. A multi-function adapter device according to claim 21, wherein data portions of the management functions of the function specific communications interface are re-mapped to correspond to the function of the second type.

23. A multi-function adapter device according to claim 21, wherein each function of the second type is assigned an unused address of the function specific communications interface.

24. A multi-function adapter device according to claim 21, wherein the controller comprises a media access controller (MAC).

25. A multi-function adapter device according to claim 21, wherein the controller comprises a Peripheral Component Interconnect (PCI) contoller.

26. A multi-function adapter device according to claim 21, wherein the internal function specific communications interface comprises an Ethernet media independent interface (MII).

27. A multi-function adapter device according to claim 26, wherein the function of the first type comprises an Ethernet switch, wherein ports of the Ethernet switch communicate over the MII and wherein control of the Ethernet switch is provided over a bus other than the MII bus.

28. A multi-function adapter device according to claim 27, wherein the function of the second type comprises an adapter for converting communications on the bus other than the MII but to MII communications so as to allow control of the Ethernet switch through the access controller.

29. A multi-function adapter device according to claim 21, wherein the function of the second type comprises a hardware address filter.

30. A multi-function adapter device according to claim 21, wherein the function of the first type comprises a network physical interface (PHY).