Method and apparatus for high-speed network adapter failover

• US 7,275,175 B2
• Filed: 07/22/2004
• Issued: 09/25/2007
• Est. Priority Date: 07/22/2004
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Cardona, Omar, Cunningham, James Brian, Li, Shouchun
• Primary Examiner(s): Maskulinski; Michael
• Application Number:
  US10/897,356
• Publication Number:
  US 20060020854A1
• Time in Patent Office: 1,160 Days
• Field of Search: 714/4
• US Class Current: 714/4.11
• CPC Class Codes: G06F 11/2005 using redundant communication controllers

Abstract

A method, apparatus, and computer instructions for facilitating failover between network adapters. A failure of a first network adapter is detected in a device driver layer. In response to detecting the failure, the transmission of data is changed by the device driver layer to a second network adapter.

Claims

1. A method in a data processing system for facilitating failover between network adapters, the method comprising:

opening a logical port by a device driver layer to transfer data to a first hardware port in a first network adapter;

detecting a failure of the first network adapter in the device driver layer; and

responsive to detecting the failure, mapping the logical port by the device driver layer to a second hardware port in a second network adapter to change the transfer of the data to the second hardware port.

2. The method of claim 1, wherein the first network adapter and the second network adapter are Ethernet network adapters.

3. The method of claim 1, wherein the second network adapter is previously initiated.

4. The method of claim 1 further comprising:

initializing the second network adapter when the first network adapter is initialized.

5. A method in a device driver layer in a data processing system for facilitating failover between network adapters, the method comprising:

responsive to opening a logical port to a first hardware port in a master network adapter by the device driver layer, initializing a backup network adapter; and

responsive to detecting a failure in the master network adapter in the device driver layer, initiating a failover action to map the logical port to a second hardware port in the backup network adapter.

6. The method of claim 5, wherein the initializing step includes:

assigning a first media access control address to the backup network adapter, wherein a media access control address is identical to a second media access control address for the master network adapter.

7. The method of claim 6, wherein the initializing step further includes:

programming the backup network adapter to use resources allocated to the master network adapter, wherein the resources are transmit and receive data buffers and descriptors.

8. The method of claim 7, wherein the initializing step further includes:

activating a link of the backup network adapter such that a transmit engine and a receive engine in the backup network adapter is in a state in which no data traffic flows on the backup network adapter.

9. The method of claim 8, wherein the failover action includes programming the backup network adapter to use a next active descriptor entry for transmit data and receive data and activating the transmit engine and the receive engine.

10. The method of claim 6 further comprising:

responsive to an absence of pending transmit data at a time when the failover action occurs, spoofing a single request packet to trigger an update to a media access control address table to allow incoming packets destined for the second media access control address to a port for the backup network adapter.

11. A data processing system for facilitating failover between network adapters, the data processing system comprising:

opening means for opening a logical port by a device driver layer to transfer data to a first hardware port in a first network adapter;

detecting means for detecting a failure of the first network adapter in the device driver layer; and

mapping means, responsive to detecting the failure, for mapping the logical port by the device driver layer to a second hardware port in a second network adapter to change the transfer of the data to the second hardware port.

12. The data processing system of claim 11, wherein the first network adapter and the second network adapter are Ethernet network adapters.

13. The data processing system of claim 11, wherein the second network adapter is previously initiated.

14. The data processing system of claim 11 further comprising:

initializing means for initializing the second network adapter when the first network adapter is initialized.

15. A device driver layer in a data processing system for facilitating failover between network adapters, the device driver layer comprising:

initializing means, responsive to opening a logical port to a first hardware port in a master network adapter by the device driver layer, for initializing a backup network adapter; and

initiating means, responsive to detecting a failure in the master network adapter in the device driver layer, for initiating a failover action to map the logical port to a second hardware port in the backup network adapter.

16. The device driver layer of claim 15, wherein the initializing means includes:

assigning means for assigning a first media access control address to the backup network adapter, wherein a media access control address is identical to a second media access control address for the master network adapter.

17. The device driver layer of claim 16, wherein the initializing means further includes:

programming means for programming the backup network adapter to use resources allocated to the master network adapter, wherein the resources allocated are transmit and receive data buffers and descriptors.

18. The device driver layer of claim 17, wherein the initializing means further includes:

activating means for activating a link of the backup network adapter such that a transmit engine and a receive engine in the backup network adapter is in a state in which no data traffic flows on the backup network adapter.

19. The device driver layer of claim 18, wherein the failover action includes programming the backup network adapter to use a next active descriptor entry for transmit data and receive data and activating the transmit engine and the receive engine.

20. The device driver layer of claim 16 further comprising:

spoofing means, responsive to an absence of pending transmit data at a time when the failover action occurs, for spoofing a single request packet to trigger an update to a media access control address table to allow incoming packets destined for the second media access control address to a port for the backup network adapter.

21. A computer program product in a computer readable recordable-type medium for facilitating failover between network adapters, the computer program product comprising:

first instructions for opening a logical port by a device driver layer to transfer data to a first hardware port in a first network adapter;

second instructions for detecting a failure of the first network adapter in the device driver layer; and

third instructions, responsive to detecting the failure, for mapping the logical port by the device driver layer to a second hardware port in a second network adapter to change the transfer of the data to the second hardware port.

22. The computer program product of claim 21, wherein the first network adapter and the second network adapter are Ethernet network adapters.

23. The computer program product of claim 21, wherein the second network adapter is previously initiated.

24. The computer program product of claim 21 further comprising:

fourth instructions for initializing the second network adapter when the first network adapter is initialized.

25. A computer program product for a device driver layer in a computer readable recordable-type medium for facilitating failover between network adapters, the computer program product comprising:

first instructions, responsive to opening a logical port to a first hardware port in a master network adapter by the device driver layer, for initializing a backup network adapter; and

second instructions, responsive to detecting a failure in the master network adapter in the device driver layer, for initiating a failover action to map the logical port to a second hardware port in the backup network adapter.

26. The computer program product of claim 25, wherein the first instructions includes:

sub-instructions for assigning a first media access control address to the backup network adapter, wherein a media access control address is identical to a second media access control address for the master network adapter.

27. The computer program product of claim 26, wherein the sub-instructions in the first instructions are first sub-instructions and further includes:

second sub-instructions for programming the backup network adapter to use resources allocated to the master network adapter, wherein the resources allocated are transmit and receive data buffers and descriptors.

28. The computer program product of claim 27, wherein the sub-instructions in the first instructions are second sub-instructions and further includes:

third sub-instructions for activating a link of the backup network adapter such that a transmit engine and a receive engine in the backup network adapter is in a state in which no data traffic flows on the backup network adapter.

29. The computer program product of claim 28, wherein the failover action includes programming the backup network adapter to use a next active descriptor entry for transmit data and receive data and activating the transmit engine and the receive engine.

30. The computer program product of claim 26 further comprising:

third instructions, responsive to an absence of pending transmit data at a time when the failover action occurs, for spoofing a single request packet to trigger an update to a media access control address table to allow incoming packets destined for the second media access control address to a port for the backup network adapter.

31. A data processing system comprising:

a bus system;

a memory connected to the bus system, wherein the memory includes a set of instructions; and

a processing unit connected to the bus system, wherein the processing unit executes a set of instructions to open a logical port by a device driver layer to transfer data to a first hardware port in a first network adapter;

detect a failure of the first network adapter in the device driver layer; and

map the logical port by the device driver layer to a second hardware port in a second network adapter to change the transfer of the data to the second hardware port, in response to detecting the failure.

32. A data processing system comprising:

a bus system;

a memory connected to the bus system, wherein the memory includes a set of instructions; and

a processing unit to the bus system, wherein the processing unit executes a set of instructions for a device driver layer to initialize a backup network adapter, in response to opening a logical port to a first hardware port in a master network adapter by the device driver layer; and

initiate a failover action to map the logical port to a second hardware port in the backup network adapter, in response to detecting a failure in the master network adapter in the device driver layer.