CN100553199C - Method of realizing group broadcasting, system and equipment based on the PCIE switching network - Google Patents
Method of realizing group broadcasting, system and equipment based on the PCIE switching network Download PDFInfo
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Abstract
The invention discloses a kind of multi-cast system based on the PCIE switching network, comprise master control borad, cable card board and PCIE interchanger, described cable card board also comprises: control unit is used to message to be sent to add specific identification information; The multicast recognition unit is connected with described control unit, is used to judge whether message to be sent is multicast message, if multicast message then sends to the multicast replication unit, if not multicast message, then directly sends to transmitting interface unit; The multicast replication unit is connected with described multicast recognition unit, is used for duplicating of multicast message, and the multicast message that duplicates is sent to transmitting interface unit; Transmitting interface unit is used for that described multicast message or non-multicast message are encapsulated as the PCIE message and sends to switching network.The present invention has simplified cable card board CPU software processes complexity for the PCIE switching network, has reduced cable card board CPU repetitive operation, improves the forwarding performance of the whole network equipment.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method of realizing group broadcasting, system and equipment based on the PCIE switching network.
Background technology
PCI Express (Peripheral Component Interconnect Express, periphery component interconnection is quick) bus is to be advocated the processor system bus of exploitation by Intel, it is a kind of serial interlinkage technology, at present accepted and become the successor of PCI, PCI-X by PCISIG, target is to replace PCI and PCI-X fully.Issue along with PCI Express (being called for short PCIE) standard, More and more factories begins to release the chip based on the PCIExpress standard, some producers have released the interchanger based on PCI Express, also become a kind of selection based on the communication equipment (as router, switch, gateway etc.) of PCIExpress interchanger.
As shown in Figure 1, be one typically based on the framework of the distributed system of PCIE interchanger, master control borad and a plurality of cable card board carry out the PCIE bus communication by the PCIE interchanger.The PCIE interchanger provides a plurality of PCIE interfaces to be connected to master control borad and cable card board (interface board, business board etc.), master control borad CPU (CentralProcess Unit, central processing unit) finishes the configuration in the PCIE terminal space of the configuration of PCIE interchanger and cable card board by the PCIE interface, guarantee that different cable card boards can carry out data communication by the PCIE switching network, cable card board message processing engine can adopt CPU, NP (Network Processor, network processing unit) or ASIC (Application Specific Integrated Circuit, application-specific integrated circuit (ASIC)) etc.
Address in the Ethernet message is not corresponding physical memory physical address, so to have defined some specific address in the ethernet specification be multicast address and broadcast address, is convenient to switching network and duplicates, and the message that duplicates all is identical to all line plates.According to the PCIE standard, the PCIE data message is through the mode of PCIE switching network employing address route, and the address of route is the address that is carried in the PCIE message.The corresponding physical memory physical address in address in the PCIE message, table 1 is a PCIE data message form, carried the physical address information of a score clamp in the PCIE message, therefore multicast replication all is different to the message of different cable card boards, and the PCIE interchanger can't be finished the function that message duplicates.
Table 1:
Therefore, a scheme is to utilize source cable card board CPU to carry out message to duplicate in the prior art.For example, for a PCIE interchanger of supporting 5 cable card boards, when cable card board 1 recognizes multicast message, message is stored in the internal memory of the direct visit of CPU, many reading of data from internal memory of CPU send this message to score clamp 2,3,4,5 by different destination addresses respectively.For same data message, the CPU of cable card board 1 need repeat to send repeatedly, causes the cable card board forwarding performance low, thereby whole network equipment forwarding performance is fallen.When cable card board was supported 10, message just needed to send 9 times, illustrated that when supporting multicast, performance will sharply descend when PCIE switching system that this scheme supports was big more.
Summary of the invention
The embodiment of the invention provides a kind of method of realizing group broadcasting based on the PCIE switching network, system and equipment, to solve the inefficient defective of PCIE switching network multicast transmission in the prior art.
The embodiment of the invention provides a kind of multi-cast system based on the PCIE switching network, comprises master control borad, cable card board and PCIE interchanger, and described master control borad and cable card board communicate by the PCIE interchanger, and described cable card board also comprises:
Control unit is used to message to be sent to add specific identification information;
The multicast recognition unit is connected with described control unit, is used to judge whether message to be sent is multicast message, if multicast message then sends to the multicast replication unit, if not multicast message, then directly sends to transmitting interface unit;
The multicast replication unit is connected with described multicast recognition unit, is used for duplicating of multicast message, and the multicast message that duplicates is sent to transmitting interface unit;
Transmitting interface unit is used for that described multicast message or non-multicast message are encapsulated as the PCIE message and sends to switching network.
Described multicast replication unit specifically comprises:
The packet buffer subelement is used to store message to be sent;
Heading is analyzed subelement, is connected with described packet buffer subelement, is used for extracting the PCIE leading address of described heading;
Payload replicon unit is analyzed subelement with described packet buffer subelement and heading respectively and is connected, and is used for reading the message payload from described packet buffer subelement, and analyzes the number of copies copy packet payload that subelement provides according to described heading;
The framing subelement is analyzed subelement with described heading respectively and is connected with payload replicon unit, is used for described PCIE leading address and message payload are sent to described transmitting interface unit.
Described specific identification information also comprises precedence information.
Described multicast replication unit also comprises:
The address caching subelement is analyzed subelement with described heading and is connected, and is used to store described PCIE leading address;
Payload buffer memory subelement is connected with described payload replicon unit, is used to store described message payload.
Described heading is analyzed subelement and is also comprised the priority recognition function, be used for obtaining precedence information from multicast message to be sent, according to described priority to PCIE leading address and message payload duplicate, framing transmits.
Described transmitting interface unit specifically comprises:
The encapsulation subelement is used for that message is encapsulated as the PCIE message and sends to switching network;
The priority mapping subelement is connected with described encapsulation subelement, is used for the traffic management field of described priority mapping to the PCIE heading.
Described control unit specifically comprises:
Multicast message receives subelement, is used to receive multicast message to be sent;
Specific identifier adds subelement, receives subelement with described multicast message and is connected, and is used for adding specific identification information at described multicast message, and described specific identification information comprises multicast message sign, PCIE leading address, PCIE leading address quantity and heading length.
The present invention also provides a kind of method of realizing group broadcasting based on the PCIE switching network, is applied to comprise that described master control borad and cable card board communicate by the PCIE interchanger, said method comprising the steps of in the communication system of master control borad, cable card board and PCIE interchanger:
Described cable card board judges whether message to be sent is multicast message, if not, then be encapsulated as the PCIE frame and directly send to switching network;
If described cable card board then obtains the PCIE leading address in the described multicast message, and according to described PCIE leading address quantity copy packet payload;
Described cable card board is encapsulated as the PCIE frame with described PCIE leading address and message payload and is forwarded to switching network.
Describedly judge that whether message to be sent is also to comprise before the multicast message:
Control unit in the described cable card board adds specific identification information in receiving message, described specific identification information comprises multicast message sign, PCIE leading address, PCIE leading address quantity and heading length.
Also comprise precedence information in the described specific identification information; According to described priority described PCIE leading address and message payload framing are forwarded to switching network, and with the traffic management field of described priority mapping to the PCIE heading.
In the embodiments of the invention,, simplified cable card board CPU software processes complexity, reduced cable card board CPU repetitive operation, improved the forwarding performance of the whole network equipment for the PCIE switching network.
Description of drawings
Fig. 1 is based on the distributed system architecture figure of PCIE interchanger in the prior art;
Fig. 2 is a kind of cable card board structural representation among the present invention;
Fig. 3 is a multicast replication cellular construction schematic diagram among the present invention;
Fig. 4 is a PCIE switch structure chart among the present invention;
Fig. 5 is a multicast message reproduction process schematic diagram among the present invention;
Fig. 6 is based on the method for realizing group broadcasting flow chart of PCIE switching network among the present invention.
Embodiment
Be elaborated below in conjunction with specific embodiment.
The invention provides a kind of multicast implementation of the network equipment, relate in particular to multicasting technology based on the network equipment of PCIE switching network, its core concept is: increase the multicast replication function between cable card board CPU and PCIE interchanger, according to the specific identifier in the CPU transmission message, carry out the payload message and duplicate, address information is also from the specific identifier in the CPU transmission message in the PCIE message that duplicates.
A kind of multi-cast system based on the PCIE switching network provided by the invention comprises master control borad, cable card board and PCIE interchanger, and master control borad and cable card board communicate by the PCIE interchanger.Wherein, cable card board comprises as shown in Figure 2: control unit is used to message to be sent to add specific identification information; The multicast recognition unit is connected with control unit, is used to judge whether message to be sent is multicast message, if multicast message then sends to the multicast replication unit, if not multicast message, then directly sends to transmitting interface unit; The multicast replication unit is connected with the multicast recognition unit, is used for duplicating of multicast message, and the multicast message that duplicates is sent to transmitting interface unit; Transmitting interface unit is used for that multicast message or non-multicast message are encapsulated as the PCIE message and sends to switching network; Reception interface unit is used to receive the PCIE message from switching network, sends to control unit after the decapsulation.More than all unit can go up realize or realize at FPGA (Field Programmable Gate Array, field programmable gate array) by special-purpose ASIC, perhaps be integrated on the cpu chip, perhaps be integrated on the PCIE exchange chip.
After the control unit CPU of cable card board receives the message that needs to send, search and transmit (for example classification chart, unicast message are transmitted, multicast message is transmitted etc.), front at this message increases specific identification information as shown in table 2, comprise: the multicast message sign, the message that 1 expression CPU sends is a multicast message, and the message that 0 expression CPU sends is common message; Heading length: the message length of expression except payload, discern the original position of payload by judging heading length; Priority: the priority that the expression message need be dispatched; Quantity, the quantity of the PCIE leading address that comprises in the presentation address head, promptly the quantity of A0, A1, A2... is discerned payload and need be duplicated how many times, and discerns the quantity and the position of PCIE leading address in the heading; PCIE leading address: the Address field of expression correspondence table 1; Keep: be convenient to realize, just in order to gather together enough the integer multiple of 128bit or 64bit, perhaps in order to expand later function.
In order to improve the bus width utilance, preferred PCIE leading address adopts 32bit mode (being the 64bit mode in the table 2).For example in the implementation that the 128bit that defines according to table 2 aligns, when quantity was 4, when adopting the 64bit address, the heading length that CPU sends was 48 bytes; And when adopting the 32bit address, the heading length that CPU sends is 32 bytes, as seen adopts the 32bit mode, and the effective bandwidth utilance is higher.
Table 2:
Control unit is by SPI4 (System Packet Interface Level 4, the 4th grade of system's packet interface), XGMII (10 Gigabit Media Independent Interface, the 10Gbps medium independent interface) etc. interface sends to the multicast recognition unit of cable card board, the multicast recognition unit is judged the first place of heading, and whether finish message is the judgement of multicast message; If the non-multicast message of message is delivered transmitting interface unit and is handled; Transmitting interface unit is encapsulated as the PCIE message of standard to message, sends on the switching network by the PCIE bus; If message is a multicast message, the multicast recognition unit is delivered the multicast replication cell processing to message, and the multicast replication unit is finished the duplicating of message, and hands to transmitting interface unit, transmitting interface unit is encapsulated as the PCIE message of standard to message, sends on the switching network by the PCIE bus.The E-Packet reception interface unit of cable card board of PCIE switching network, reception interface unit is converted into the message that the interfaces such as SPI4/XGMII of control unit can discern to the PCIE message and sends to control unit.
Wherein, the multicast replication unit specifically comprises as shown in Figure 3: the packet buffer subelement is used to store message to be sent; Heading is analyzed subelement, is connected with the packet buffer subelement, is used for extracting the PCIE leading address of heading; Payload replicon unit is analyzed subelement with packet buffer subelement and heading respectively and is connected, and is used for reading the message payload from the packet buffer subelement, and analyzes the number of copies copy packet payload that subelement provides according to heading; The framing subelement is analyzed subelement with heading respectively and is connected with payload replicon unit, is used for PCIE leading address and message payload are sent to transmitting interface unit; The multicast replication unit also comprises: the address caching subelement, and analyze subelement with heading and be connected, be used to store the PCIE leading address; Payload buffer memory subelement is connected with payload replicon unit, is used for the stored messages payload.Though the framing subelement in the present embodiment only carries out the forwarding work of PCIE leading address and message payload, the frame encapsulation work is finished by transmitting interface unit, and in fact the framing subelement also can increase the encapsulation function of PCIE leading address and message payload.
The concrete course of work is: the message that the multicast replication unit receives is stored in earlier in the packet buffer subelement, heading analysis subelement reads the heading data in the packet buffer subelement, and the PCIE leading address (reference table 2 in the extraction heading, as A0, A1...), store in the address caching subelement, simultaneously the number of copies of message is sent to payload replicon unit, payload replicon unit reads the message payload from the packet buffer subelement, and according to number of copies, copy packet is to payload buffer memory subelement; The framing subelement is transferred to the PCIE message that transmitting interface unit is encapsulated as standard to the data of address caching subelement and payload buffer memory subelement, is forwarded to the PCIE switching network.
In addition, can carry out priority control to multicast message among the present invention, to satisfy to network service quality the have relatively high expectations user or the business of demand, for example, the service quality of the video conference service quality that may require the quality of service requirement user higher, that defrayment is more than data distribution to obtain is better.In order to satisfy the service quality in the multicast service, the present invention further requires to carry in the message precedence information (as the priority of table 2), heading is analyzed subelement and is discerned the priority that is arranged in the message, and notify payload replicon unit precedence information, heading is analyzed subelement and payload replicon unit copies to message in the height priority level formation of address caching subelement and payload buffer memory subelement according to priority of messages; The framing subelement is dispatched forwarding according to various priority (as strict priority, weight priority etc.) mode, makes the message of high priority preferentially obtain transmitting, and precedence information is offered transmitting interface unit.Transmitting interface unit is when encapsulation PCIE message, TC (the Traffic Class of this priority mapping to the PCIE heading, flow grade) field, thereby go into the different VC (VirtualChannel of switching network, Virtual Channel), realize the different data messages and the service message of the different wiring boards of classification processing, realize different QoS (Quality of Service, service quality).Simultaneously, carry out the priority control of multicast message, to the influence of unicast message, unicast message is dispatched in the highest formation of priority, thereby avoid congested in the time of can also avoiding a large amount of multicast messages to produce, guarantee the reliable and stable operation of the network equipment.
Correspondingly, the PCIE switch then can be according to TC information in inside to the data message classify classification scheduling handle, at this moment, a kind of preferred construction of PCIE switch inside can be referring to shown in Figure 4, comprise: the Classification Management unit is used to preserve traffic classification TC, tunnel VC and cable card board information three's corresponding relation; The channel management unit is used to safeguard a plurality of VC, according to the data message that carries TC information that the corresponding relation of preserving in the described Classification Management unit and any one cable card board are sent, selects a VC, and this data message is sent among the selected VC; The data forwarding unit is used for the priority according to described channel management each VC of unit, transmits the data message among each VC successively.
Transmitting interface unit specifically comprises: the encapsulation subelement is used for that message is encapsulated as the PCIE message and sends to switching network; The priority mapping subelement is connected with the encapsulation subelement, is used for the traffic management field of priority mapping to the PCIE heading.
Control unit specifically comprises: multicast message receives subelement, is used to receive multicast message to be sent; Specific identifier adds subelement, receiving subelement with multicast message is connected, be used for adding specific identifier at multicast message, specific identifier comprise multicast message sign, PCIE leading address (A0, A1...), PCIE leading address quantity, heading length, precedence information and reserved field.
As Fig. 5 is exactly the multicast message reproduction process, and CPU sends a message that carries a plurality of addresses, sends to switching network by copying as a plurality of PCIE messages, is forwarded to the CPU of different ply-yarn drills by the PCIE switching network.
The present invention also provides a kind of method of realizing group broadcasting based on the PCIE switching network, be applied to comprise in the communication system of master control borad, cable card board and PCIE interchanger, described master control borad and cable card board communicate by the PCIE interchanger, multicast recognition device and multicast replication device have been increased on the described cable card board, this device can be realized on FPGA or realize by special-purpose ASIC, perhaps be integrated on the cpu chip, perhaps be integrated on the PCIE exchange chip.This method may further comprise the steps as shown in Figure 6:
Step s101, control unit adds specific identification information in receiving message, and described specific identification information comprises multicast message sign, PCIE leading address, PCIE leading address quantity and heading length.
Step s102, multicast recognition device judge whether message to be sent is multicast message, if not, then change step s103, if then change step s104.
Step s103, the multicast recognition device is encapsulated as the PCIE frame with non-multicast message and directly sends to switching network.
Step s104, multicast replication device obtain the PCIE leading address in the described multicast message, and according to described PCIE leading address quantity copy packet payload.Also comprise precedence information in the described specific identification information; According to described priority described PCIE leading address and message payload framing are forwarded to switching network, and with the traffic management field of described priority mapping to the PCIE heading.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1, a kind of multi-cast system based on the PCIE switching network comprises master control borad, cable card board and PCIE interchanger, and described master control borad and cable card board communicate by the PCIE interchanger, it is characterized in that, described cable card board also comprises:
Control unit is used to message to be sent to add specific identification information;
The multicast recognition unit is connected with described control unit, is used to judge whether message to be sent is multicast message, if multicast message then sends to the multicast replication unit, if not multicast message, then directly sends to transmitting interface unit;
The multicast replication unit is connected with described multicast recognition unit, is used for duplicating of multicast message, and the multicast message that duplicates is sent to transmitting interface unit;
Transmitting interface unit is used for that described multicast message or non-multicast message are encapsulated as the PCIE message and sends to switching network.
According to claim 1 based on the multi-cast system of PCIE switching network, it is characterized in that 2, described multicast replication unit specifically comprises:
The packet buffer subelement is used to store message to be sent;
Heading is analyzed subelement, is connected with described packet buffer subelement, is used for extracting the PCIE leading address of described heading;
Payload replicon unit is analyzed subelement with described packet buffer subelement and heading respectively and is connected, and is used for reading the message payload from described packet buffer subelement, and analyzes the number of copies copy packet payload that subelement provides according to described heading;
The framing subelement is analyzed subelement with described heading respectively and is connected with payload replicon unit, is used for described PCIE leading address and message payload are sent to described transmitting interface unit.
3, as described in the claim 2 based on the multi-cast system of PCIE switching network, it is characterized in that described multicast replication unit also comprises:
The address caching subelement is analyzed subelement with described heading and is connected, and is used to store described PCIE leading address;
Payload buffer memory subelement is connected with described payload replicon unit, is used to store described message payload.
4, as described in the claim 2 based on the multi-cast system of PCIE switching network, it is characterized in that described specific identification information also comprises precedence information.
5, as described in the claim 4 based on the multi-cast system of PCIE switching network, it is characterized in that, described heading is analyzed subelement and is also comprised the priority recognition function, be used for obtaining precedence information from multicast message to be sent, according to described priority to PCIE leading address and message payload duplicate, framing transmits.
6, as described in the claim 5 based on the multi-cast system of PCIE switching network, it is characterized in that described transmitting interface unit specifically comprises:
The encapsulation subelement is used for that message is encapsulated as the PCIE message and sends to switching network;
The priority mapping subelement is connected with described encapsulation subelement, is used for the traffic management field of described priority mapping to the PCIE heading.
According to claim 1 based on the multi-cast system of PCIE switching network, it is characterized in that 7, described control unit specifically comprises:
Multicast message receives subelement, is used to receive multicast message to be sent;
Specific identifier adds subelement, receives subelement with described multicast message and is connected, and is used for adding specific identification information at described multicast message, and described specific identification information comprises multicast message sign, PCIE leading address, PCIE leading address quantity and heading length.
8, a kind of method of realizing group broadcasting based on the PCIE switching network is applied to comprise that described master control borad and cable card board communicate by the PCIE interchanger, it is characterized in that, said method comprising the steps of in the communication system of master control borad, cable card board and PCIE interchanger:
Described cable card board judges whether message to be sent is multicast message, if not, then be encapsulated as the PCIE frame and directly send to switching network;
If then described cable card board obtains the PCIE leading address in the described multicast message, and according to described PCIE leading address quantity copy packet payload;
Described cable card board is encapsulated as the PCIE frame with described PCIE leading address and message payload and is forwarded to switching network.
9, as described in the claim 8 based on the method for realizing group broadcasting of PCIE switching network, it is characterized in that, describedly judge that whether message to be sent is also to comprise before the multicast message:
Control unit in the described cable card board adds specific identification information in receiving message, described specific identification information comprises multicast message sign, PCIE leading address, PCIE leading address quantity and heading length.
10, as described in the claim 9 based on the method for realizing group broadcasting of PCIE switching network, it is characterized in that, also comprise precedence information in the described specific identification information; According to described priority described PCIE leading address and message payload framing are forwarded to switching network, and with the traffic management field of described priority mapping to the PCIE heading.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101262436B (en) * | 2008-04-08 | 2011-04-13 | 华为技术有限公司 | Multicast duplication method, device and line card |
| CN101296186B (en) * | 2008-06-13 | 2010-12-22 | 杭州华三通信技术有限公司 | Routing switching device, method and switching cable fastener plate |
| CN101340389B (en) * | 2008-08-29 | 2011-04-20 | 华为技术有限公司 | Multicast packet copy method and apparatus |
| CN101459607B (en) * | 2008-12-31 | 2011-11-02 | 华为技术有限公司 | Packet transmitting method and router |
| CN101895796B (en) * | 2010-07-26 | 2014-03-19 | 中兴通讯股份有限公司 | Method and system for realizing multicasting in GPON network, and optical network unit |
| WO2012103704A1 (en) * | 2011-06-24 | 2012-08-09 | 华为技术有限公司 | Multicast duplication method, device and system |
| CN102263698B (en) * | 2011-08-11 | 2014-01-22 | 福建星网锐捷网络有限公司 | Method for establishing virtual channel, method of data transmission and line card |
| CN102299857B (en) * | 2011-09-15 | 2014-10-29 | 福建星网锐捷网络有限公司 | Multicast message processing method, line card and communication equipment |
| CN102916874B (en) * | 2012-09-29 | 2016-06-08 | 杭州华三通信技术有限公司 | A kind of file transmitting method and equipment |
| CN104901891A (en) * | 2014-03-07 | 2015-09-09 | 中兴通讯股份有限公司 | Method and device for forwarding multicast message |
| CN107888518A (en) * | 2017-10-20 | 2018-04-06 | 深圳市楠菲微电子有限公司 | For the method and device to E-Packet |
| CN114157533B (en) * | 2021-12-06 | 2023-05-26 | 北京锐安科技有限公司 | Message cross-board multicast replication forwarding method and system based on CLOS architecture |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091021 Termination date: 20200921 |