CA2493506A1 - Methods and apparatus for credit-based flow control - Google Patents
Methods and apparatus for credit-based flow control Download PDFInfo
- Publication number
- CA2493506A1 CA2493506A1 CA002493506A CA2493506A CA2493506A1 CA 2493506 A1 CA2493506 A1 CA 2493506A1 CA 002493506 A CA002493506 A CA 002493506A CA 2493506 A CA2493506 A CA 2493506A CA 2493506 A1 CA2493506 A1 CA 2493506A1
- Authority
- CA
- Canada
- Prior art keywords
- network node
- ready signal
- frames
- credit information
- fibre channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract 22
- 239000000872 buffer Substances 0.000 claims abstract 29
- 239000000835 fiber Substances 0.000 claims 12
- 230000005540 biological transmission Effects 0.000 claims 4
- 238000001514 detection method Methods 0.000 claims 2
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/39—Credit based
Abstract
Methods and apparatus are provided for credit-based flow control. Techniques allow a receiver to provide buffer characteristic information to a sender using a single extended receiver ready signal. Multiple credits can be allocated using a single extended receiver ready signal as well. Counters and registers are used to allow for the accidental loss of extended receiver ready signals while still maintaining an accurate reflection of the types and numbers of buffers available.
Claims (37)
1. A method for flow control at a network switch, the method comprising:
receiving a plurality of frames at a fibre channel switch from a first network node;
forwarding the plurality of frames;
modifying credit information associated with the first network node based on the number of frames forwarded; and providing an extended receiver ready signal to the first network node, the extended receiver ready signal including credit information indicating to the first network node that a plurality of buffers are available to receive transmissions from the first network node.
receiving a plurality of frames at a fibre channel switch from a first network node;
forwarding the plurality of frames;
modifying credit information associated with the first network node based on the number of frames forwarded; and providing an extended receiver ready signal to the first network node, the extended receiver ready signal including credit information indicating to the first network node that a plurality of buffers are available to receive transmissions from the first network node.
2. The method of claim 1, wherein the extended receiver ready signal further includes priority information.
3. The method of claim 2, wherein the priority information is used to differentiate amongst eight levels of priority.
4. The method of any of claims 1-3, further comprising providing an initialization extended receiver ready signal to the first network node before receiving the plurality of frames.
5. The method of claim 4, wherein the initialization extended receiver ready signal includes initialization credit information.
6. The method of claim 4, wherein the initialization credit information is a buffer advertisement for determining an initial number of credits available to the first network node.
7. The method of claim 6, wherein each credit allows the first network node to transmit a single frame.
8. The method of claim 5, wherein the initialization credit information is a buffer advertisement for determining an initial number of buffers available for receipt of frames from a first network node.
9. The method of any of claims 1-8, wherein the credit information is a buffer advertisement for determining a relative number of credits available to the first network node.
10. The method of claim 9, wherein the credit information is a buffer advertisement for determining a relative number of buffers available for receipt of frames from a first network node.
11. The method of claim 10, wherein the fibre channel switch maintains the last buffer advertisement provided to the first network node.
12. The method of claim 10, wherein the first network node maintains the last buffer advertisement received from the fibre channel switch.
13. The method of claim 12, wherein the first network node further maintains a credit value indicating the number of buffers available to receive transmissions from the first network node.
14. The method of claim 13, wherein the credit value is calculated by subtracting the last buffer advertisement from a current buffer advertisement received from the fibre channel switch.
15. The method of claim 8, wherein each buffer is configured to hold a single frame.
16. The method of any of claims 1-15, wherein the extended receiver ready signal further comprises an error detection code.
17. The method of any of claims 1-16, wherein the extended receiver ready signal is an ordered set.
18. The method of claim 17, wherein the extended receiver ready signal is transmitted after two idle ordered sets are transmitted.
19. A network node coupled to a fibre channel switch, the network node comprising:
an output interface operable to transmit a plurality of frames to a fibre channel switch;
an input interface operable to receive an extended ready signal from the fibre channel switch, the extended ready signal including credit information;
a processor coupled to the input interface and the output interface, the processor configured to use the credit information to determine the number of buffers available to receive transmissions from the network node.
an output interface operable to transmit a plurality of frames to a fibre channel switch;
an input interface operable to receive an extended ready signal from the fibre channel switch, the extended ready signal including credit information;
a processor coupled to the input interface and the output interface, the processor configured to use the credit information to determine the number of buffers available to receive transmissions from the network node.
20. The network node of claim 19, wherein the extended receiver ready signal further includes priority information.
21 21. The network node of claim 20, wherein the priority information is used to differentiate amongst eight levels of priority.
22. The network node of any of claims 19-21, wherein the input interface is further configured to receive an initialization receiver ready signal from the fibre channel switch before sending the plurality of frames.
23. The network node of claim 22, wherein the initialization extended receiver ready signal includes initialization credit information.
24. The network node of claim 22, wherein the initialization credit information is a buffer advertisement indicating an initial number of credits available to the network node.
25. The network node of claim 24, wherein each credit allows the network node to transmit a single frame.
26. The network node of claim 23, wherein the initialization credit information is a buffer advertisement for determining an initial number of buffers available for receipt of frames from a network node.
27. The network node of any of claims 19-26, wherein the credit information is a~ buffer advertisement for determining a relative number of credits available to the network node.
28. The network node of claim 27, wherein the credit information is a buffer advertisement for determining a relative number of buffers available for receipt of frames from a network node.
29. The network node of claim 28, wherein the fibre channel switch maintains the last buffer advertisement provided to the network node.
30. The network node of claim 28, wherein the network node maintains the last buffer advertisement received from the fibre channel switch.
31. The network node of claim 30, wherein the network node further maintains a credit value indicating the number of buffers available to transmit frames to another network node.
32. The network node of claim 31, wherein the credit value is calculated by subtracting the last buffer advertisement from a current buffer advertisement received from the fibre channel switch.
33. The network node of claim 26, wherein each buffer is configured to hold a single frame.
34. The network node of any of claims 19-33, wherein the extended ready signal further comprises an error detection code.
35. The network node of any of claims 19-34, wherein the extended ready signal is an ordered set.
36. The network node of claim 35, wherein the extended ready signal is transmitted after two idle ordered sets are transmitted.
37. An network switch, comprising:
means for receiving a plurality of frames at a fibre channel switch from a first network node;
means for forwarding the plurality of frames;
means for modifying credit information associated with the first network node based on the number of frames forwarded; and means for providing an extended receiver ready signal to the first network node, the extended receiver ready signal including credit information indicating to the first network node that a plurality of buffers are available to receive transmissions from the first network node.
means for receiving a plurality of frames at a fibre channel switch from a first network node;
means for forwarding the plurality of frames;
means for modifying credit information associated with the first network node based on the number of frames forwarded; and means for providing an extended receiver ready signal to the first network node, the extended receiver ready signal including credit information indicating to the first network node that a plurality of buffers are available to receive transmissions from the first network node.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/205,668 US7474613B2 (en) | 2002-07-25 | 2002-07-25 | Methods and apparatus for credit-based flow control |
| US10/205,668 | 2002-07-25 | ||
| PCT/US2003/021900 WO2004012404A2 (en) | 2002-07-25 | 2003-07-14 | Methods and apparatus for credit-based flow control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2493506A1 true CA2493506A1 (en) | 2004-02-05 |
| CA2493506C CA2493506C (en) | 2012-07-10 |
Family
ID=31186611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2493506A Expired - Fee Related CA2493506C (en) | 2002-07-25 | 2003-07-14 | Methods and apparatus for credit-based flow control |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7474613B2 (en) |
| EP (1) | EP1532775B1 (en) |
| CN (1) | CN1706157A (en) |
| CA (1) | CA2493506C (en) |
| WO (1) | WO2004012404A2 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7327680B1 (en) * | 2002-11-05 | 2008-02-05 | Cisco Technology, Inc. | Methods and apparatus for network congestion control |
| US7391728B2 (en) * | 2003-12-30 | 2008-06-24 | Cisco Technology, Inc. | Apparatus and method for improved Fibre Channel oversubscription over transport |
| US7986630B1 (en) * | 2004-02-09 | 2011-07-26 | Lsi Corporation | High performance architecture for fiber channel targets and target bridges |
| US7719964B2 (en) * | 2004-08-12 | 2010-05-18 | Eric Morton | Data credit pooling for point-to-point links |
| US7385925B2 (en) * | 2004-11-04 | 2008-06-10 | International Business Machines Corporation | Data flow control method for simultaneous packet reception |
| US20060114930A1 (en) * | 2004-11-17 | 2006-06-01 | International Business Machines (Ibm) Corporation | In-band control of indicators to identify devices distributed on the same domain |
| US7965940B1 (en) * | 2006-07-12 | 2011-06-21 | Cisco Technology, Inc. | Transparent fiber channel link management for protocol transport |
| CN101917231B (en) * | 2010-08-27 | 2013-10-09 | 华为技术有限公司 | Data caching method of fibre channel switch |
| CN102546098B (en) * | 2011-12-15 | 2015-01-21 | 福建星网锐捷网络有限公司 | Data transmission device, method and system |
| US9674098B2 (en) * | 2013-07-02 | 2017-06-06 | Intel Corporation | Credit flow control for ethernet |
| US9325449B2 (en) * | 2013-12-06 | 2016-04-26 | Intel Corporation | Lane error detection and lane removal mechanism to reduce the probability of data corruption |
| US9385962B2 (en) * | 2013-12-20 | 2016-07-05 | Intel Corporation | Method and system for flexible credit exchange within high performance fabrics |
| EP2930964B1 (en) | 2014-04-09 | 2019-02-27 | Linear Technology Corporation | Hardware-based licensing for wireless networks |
| CN107979544A (en) * | 2016-10-25 | 2018-05-01 | 华为技术有限公司 | A kind of retransmission method of IP packet, equipment and system |
| US20190236038A1 (en) * | 2018-12-20 | 2019-08-01 | Swadesh Choudhary | Buffered interconnect for highly scalable on-die fabric |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610745A (en) * | 1995-10-26 | 1997-03-11 | Hewlett-Packard Co. | Method and apparatus for tracking buffer availability |
| US5999518A (en) * | 1996-12-04 | 1999-12-07 | Alcatel Usa Sourcing, L.P. | Distributed telecommunications switching system and method |
| FR2759518B1 (en) * | 1997-02-07 | 1999-04-23 | France Telecom | METHOD AND DEVICE FOR ALLOCATING RESOURCES IN A DIGITAL PACKET TRANSMISSION NETWORK |
| DE60040553D1 (en) * | 1999-12-10 | 2008-11-27 | Qlogic Switch Products Inc | Method and apparatus for credit-based flow control in Fiber Channel systems |
| US7042842B2 (en) * | 2001-06-13 | 2006-05-09 | Computer Network Technology Corporation | Fiber channel switch |
| US20030074449A1 (en) * | 2001-10-12 | 2003-04-17 | Rory Smith | Bandwidth allocation in a synchronous transmission network for packet oriented signals |
| US7471628B2 (en) * | 2002-06-10 | 2008-12-30 | Cisco Technology, Inc. | Intelligent flow control management to extend fibre channel link full performance range |
| US7233570B2 (en) * | 2002-07-19 | 2007-06-19 | International Business Machines Corporation | Long distance repeater for digital information |
| US6859437B2 (en) * | 2002-11-05 | 2005-02-22 | Nortel Networks Limited | Method and system for extending the reach of a data communication channel using a flow control interception device |
-
2002
- 2002-07-25 US US10/205,668 patent/US7474613B2/en active Active
-
2003
- 2003-07-14 EP EP03771608.1A patent/EP1532775B1/en not_active Expired - Lifetime
- 2003-07-14 CN CNA038178567A patent/CN1706157A/en active Pending
- 2003-07-14 WO PCT/US2003/021900 patent/WO2004012404A2/en not_active Application Discontinuation
- 2003-07-14 CA CA2493506A patent/CA2493506C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004012404A3 (en) | 2005-03-24 |
| CA2493506C (en) | 2012-07-10 |
| EP1532775B1 (en) | 2017-06-21 |
| EP1532775A2 (en) | 2005-05-25 |
| US20040027987A1 (en) | 2004-02-12 |
| AU2003249201A1 (en) | 2004-02-16 |
| WO2004012404A2 (en) | 2004-02-05 |
| US7474613B2 (en) | 2009-01-06 |
| CN1706157A (en) | 2005-12-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20180716 |