Counter functions in an application program interface for network devices

• US 7,509,656 B2
• Filed: 08/02/2002
• Issued: 03/24/2009
• Est. Priority Date: 08/02/2002
• Status: Active Grant

• Current Assignee: Intellectual Ventures Assets 197 LLC (Intellectual Ventures LLC)
• Original Assignee: Null Networks LLC (Intellectual Ventures LLC)
• Inventors: Wang, Zhi, Bian, Qiyong B.
• Primary Examiner(s): Zhen; Li B
• Application Number:
  US10/211,046
• Publication Number:
  US 20040025172A1
• Time in Patent Office: 2,426 Days
• Field of Search: 719/328, 370/252, 714/39, 709/224
• US Class Current: 719/328
• CPC Class Codes: G06F 9/545 where tasks reside in different layers, e.g. user- and kernel-space

Abstract

Application program interface (API) reads a count value from a hardware counter in a network device. Then, the API resets the hardware counter and uses the count value to update a software counter. The software counter is stored in a memory location corresponding to the hardware counter. The memory is accessible both by the API and an application program using the API.

Claims

1. A method performed by an application program interface (API), the method comprising:

reading a count value from a hardware counter in a network device;

resetting the hardware counter;

updating a software counter with the count value, said software counter being stored in a memory location in a memory, said memory location being associated with the hardware counter, and said memory being accessible by at least one of the API and an application program using the API;

reading a plurality of additional count values from a plurality of additional hardware counters;

resetting the plurality of additional hardware counters;

updating a plurality of additional software counters with the plurality of additional count values, said plurality of additional software counters being stored in a plurality of additional memory locations in the memory, at least one of said additional memory locations being associated with a respective one of the plurality of additional hardware counters; and

receiving a function command from the application program prior to reading the count value or the plurality of additional count values, said function command to identify the hardware counter and the plurality of additional hardware counters from among a plurality of hardware counters and to initiate the reading, resetting, and updating, wherein each of the plurality of hardware counters is individually identified by a mask index, and wherein the application program provides a single index value to identify the hardware counter and the plurality of additional hardware counters by performing a logical CR operation on respective mask indices for the hardware counter and the plurality of additional hardware counters.

2. The method of claim 1 wherein the hardware counter is configured to count up to a first maximum count value and the software counter configured to count up to a second maximum count value higher than the first maximum count value .

3. The method of claim 1 further comprising:

repeating the reading, reselling, and updating at a periodic rate having a period that is shorter than an accumulation period before overflow for any of the hardware counter and the plurality of additional hardware counters.

4. The method of claim 3 wherein receiving a function command from the application program prior to reading the count value, includes identifyjpg the period for repeating, and initiatinge the repeating.

5. The method of claim 1 wherein the software counter has a longer accumulation period before overflow than the hardware counter or one of the plurality of additional hardware counters.

6. The method of claim 1 wherein the hardware counter has a bit width equal to one of 16 bits and 32 bits, and the software counter has a bit width equal to 64 bits.

7. The method of claim 1 further comprising:

providing a pointer for the memory location, and a corresponding index for the hardware counter, to the application program.

8. The method of claim 1 wherein the network device comprises a multi-protocol optical networking module having a serial optical interface, a parallel electrical interface, and a control processor interface.

9. The method of claim 1 wherein the network device comprises a network protocol processor to perform line-speed network traffic processing, wherein said line-speed network traffic processing includes using the hardware counter to count network traffic events.

10. The method of claim 9 wherein the network traffic events are selected from the group consisting of bits of traffic, bytes of traffic, frames of traffic, packets of traffic, bytes of overhead in traffic, bytes of payload in traffic, and data errors in traffic.

11. The method of claim 1 wherein the reading, resetting and updating to provide to the API and the application program using the API, a network device with a larger hardware counter than the network device is nominally configured.

12. The method of claim 1 wherein the plurality of additional hardware counters have a uniform bit width.

13. The method of claim 1 wherein the plurality of additional hardware counters have a plurality of different bit widths.

14. The method of claim 1 wherein the plurality of additional software counters each have a uniform bit width.

15. The method of claim 1 wherein the hardware counter and the plurality of additional hardware counters are located among a plurality of functional blocks within the network device.

16. The method of claim 1 wherein the network device comprises a first network device, and wherein the hardware counter and the plurality of additional hardware counters are located among a plurality of network devices including the first network device.

17. The method of claim 1 further comprising:

receiving a call-back command from the application program, said call back command including an event threshold relative to a current count value of the software counter;

monitoring the software counter to determine when the event threshold is exceeded; and

initiating a call-back to the application program in response to the event threshold being exceeded.

18. The method of claim 1 further comprising:

receiving a call-back command from the application program;

detecting a saturation condition at the hardware counter during reading; and

initiating a call-back to the application program in response to the saturation condition.

19. The method of claim 18 wherein the saturation condition indicates to the application program that the hardware counter should be read and reset more frequently.

20. An apparatus comprising:

means for reading a count value from a hardware counter in a network device7 means for resetting the hardware counter; and

means for updating a software counter with the count value count value to a current value stored in said software counter, said software counter being stored in a memory location in a memory , said memory location being associated with the hardware counter, and said memory being accessible by at least one of an application program interface (API) and an application program using the API;

means for reading a plurality of additional count values from a plurality of additional hardware counters;

means for resetting the plurality of additional hardware counters;

means for updating a plurality of additional software counters with the plurality of additional count values, said plurality of additional software counters being stored in a plurality of additional memory locations in the memory, at least one of said additional memory locations being associated with a respective one of the plurality of additional hardware counters; and

means for receiving a function command from the application program prior to reading the count value or the plurality of additional count values, said function command to identify the hardware counter and the plurality of additional hardware counters from among a plurality of hardware counters and to initiate the reading, resetting, and updating, wherein each of the plurality of hardware counters is individually identified by a mask index, and wherein the application program provides a single index value to identify the hardware counter and the luralit of additional hardware counters by performing a logical OR operation on respective mask indices for the hardware counter and the plurality of additional hardware counters.

21. The apparatus of claim 20 wherein the means for repeating the reading, resetting, and updating at a periodic rate having a period that is shorter than an accumulation period before overflow for the hardware counter.

22. The apparatus of claim 21 wherein the means for receiving the function command from the application program prior to reading the count value includes means for identifying the period for repeating, and initiating the repeating.

23. The apparatus of claim 20 further comprising:

means for providing a pointer for the memory location, and a corresponding index for the hardware counter, to the application program.

24. The apparatus of claim 20 wherein the network device comprises a network protocol processor to perform line-speed network traffic processing, wherein said line-speed network traffic processing includes using the hardware counter to count network traffic events.

25. The apparatus of claim 20 further comprising:

means for repeating the reading, resetting, and updating at a periodic rate having a period that is shorter than an accumulation period before overflow for any of the hardware counter and the plurality of additional hardware counters.

26. The apparatus of claim 20 further comprising:

means for receiving a call-back command from the application program, said call back command including an event threshold relative to a current count value of the software counter;

means for monitoring the software counter to determine when the event threshold is exceeded; and

means for initiating a call-back to the application program in response to the event threshold being exceeded.

27. The apparatus of claim 20 further comprising:

means for detecting a saturation condition at the hardware counter during reading; and

means for notifying the application program of the saturation condition.

28. An apparatus, comprising:

a processor;

a networking interface coupled to the processor, including a hardware counter, to couple the apparatus to a network, the hardware counter configured to hold a first maximum counter value; and

a storage medium coupled to a processor, having storage locations, a subset of which configurable to be a software counter, and programming instructions stored therein, to be executed by the processor, to;

read a count value from the hardware counter;

reset the hardware counter;

update the software counter with the count value by adding the count value to a current value stored in said software counter;

read a plurality of additional count values from a plurality of additional hardware counters;

reset the plurality of additional hardware counters;

undate a plurality of additional software counters with the plurality of additional count values, said plurality of additional software counters being stored in a plurality of additional storage locations in the storage medium, at least one of said additional storage locations being associated with a respective one of the plurality of additional hardware counters; and

receive a function command from the application program prior to reading the count value or the plurality of additional count values, said function command to identify the hardware counter and the plurality of additional hardware counters from among a plurality of hardware counters and to initiate the reading, resetting, and updating, wherein each of the plurality of hardware counters is individually identified by a mask index, and wherein the application program provides a single index value to identify the hardware counter and the plurality of additional hardware counters by performing a logical OR operation on respective mask indices for the hardware counter and the plurality of additional hardware counters.

29. The apparatus of claim 28 wherein the programming instructions to update the software counter with the count value to effectively provide the application program a larger counter than one of the hardware counter and the plurality of additional hardware counters are nominally configured, said software counter being configured to hold a second maximum counter value larger than the first maximum counter value.

30. The apparatus of claim 28 wherein the programming instructions further include instructions for repeating the read, the reset and the update at a periodic rate having a period that is shorter than an accumulation period before overflow for the hardware counter or one of the plurality of additional hardware counters.

31. The apparatus of claim 30 wherein the programming instructions further include instructions for receiving a function command from the application program prior to read of the count value, said function command to identify the period for repeating, and initiate the repeating.

32. The apparatus of claim 28 wherein the network interface includes a network protocol processor to perform line-speed network traffic processing, wherein said line-speed network traffic processing includes using the hardware counter to count network traffic events.