CN102769869A - Message rapid forwarding system of control and provisioning of wireless access point - Google Patents
Message rapid forwarding system of control and provisioning of wireless access point Download PDFInfo
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Abstract
The invention provides a message rapid forwarding system of a control and provisioning of wireless access point (CAPWAP). The rapid forwarding system comprises an Ethernet switching chip, a wide area network (WAN) port, a field-programmable gate array (FPGA) unit, and a processor unit, wherein the field-programmable gate array unit is used for receiving the message from the Ethernet switching chip or the WAN port, searching a list item corresponding to a quintuple of the message from a hash table, if corresponding list item is found out, transmitting the message to the processor unit, receiving packaged message from the processor unit and transmitting the message to the Ethernet switching chip or the WAN port, and building a new list item corresponding to the quintuple of the packaged message in the hash table, if corresponding list item is found out, packaging the message according to the searched list item, and transmitting the e packaged message to the Ethernet switching chip or the WAN port, and the processor unit is used for packaging the message transmitted by the FPGA unit, and transmitting the packaged message to the FPGA unit.
Description
Technical field
The application relates to wireless communication technology, more specifically, relates to a kind of programmable gate array at the scene (FPGA) and goes up control and the quick system that transmits of configuration (CAPWAP) message that realizes WAP.
Background technology
Wireless controller (AC) is a kind of network equipment, is the core of wireless network, is in charge of the thin WAP (AP) in the wireless network.Wireless network of today covers, and adopts an AC to add the mode of a plurality of AP more, helps the centralized management of wireless network.AC controls AP through wireless access point control and configuration protocol (CAPWAP); Concentrating under the forward mode; All messages of (STA) of standing all are packaged into the CAPWAP message again by transmitting behind the AC deblocking by AP; The realization of CAPWAP function mainly is under the three-layer network transmission mode at present; All CAPWAP messages all are packaged into User Datagram Protocol (UDP) form in Internet protocol (IP) transmission through network, and CAPWAP tunnel also is to be safeguarded by the interface IP address of AC and the IP address of web tool platform (WTP).
The technology of most critical is exactly the processing of CAPWAP business datum among the AC, since tunnel quantity many (reaching millions of simultaneous tunnels), service traffics big (up to the service traffics of 20～30Gbps) are very high to the performance requirement of AC.
Present AC adopts high-performance multi-core CPU processor as data retransmission platform more, and uses such as the dynamic random access memory (DRAM) of Double Data Rate Synchronous Dynamic Random Access Memory (DDR) 2 or DDR3 to come stored messages and transmit.Yet can there be following shortcoming in such scheme:
1, handle undesirable for short bag;
2, CPU transmits linear speed the exchange capacity deficiency, particularly short message in application, and decreased performance is more serious;
3, high-performance multi-core CPU power consumption is very big, and is high to the system radiating Capability Requirement;
4, the DRAM handling capacity of DDR2/3 is limited, must use a plurality of DRAM interface concurrents just can raise the efficiency;
5, CPU needs repeatedly access memory to the processing of a message, further degrade performance.
Summary of the invention
The object of the present invention is to provide a kind of control and the quick repeater system of configuration (CAPWAP) message of WAP, comprising: Ethernet switching chip; Wide area network (WAN) port; Field programmable gate array (FPGA) unit; Be used for receiving message, and from Hash table, search and the corresponding list item of the five-tuple of message, if do not find corresponding list item from Ethernet switching chip or WAN port; Then message is sent to processor unit; Receive the message of encapsulation and send to Ethernet switching chip unit or WAN port from processor unit subsequently, and in Hash table, set up and the corresponding new list item of the five-tuple of the message that encapsulates, if find corresponding list item; Then message is encapsulated, and the message of encapsulation is sent to Ethernet switching chip unit or WAN port according to the list item that finds; Processor unit is used for the message that the FPGA unit sends is encapsulated, and the message of encapsulation is sent to the FPGA unit.
The five-tuple of message can comprise source IP address, purpose IP address, source port number, destination slogan and the IP agreement of message.
Each list item of Hash table can comprise five-tuple and source MAC, the target MAC (Media Access Control) address of message.
For CAPWAP message, do not find and to comprise with the corresponding list item of the five-tuple of message and can not obtain that five-tuple, five-tuple are searched failure, message need be recombinated or message right and wrong CAPWAP message from WAP (AP); For IP message, do not find and to comprise with the corresponding list item of the five-tuple of message and can not obtain that five-tuple, five-tuple are searched failure or message needs burst from the Internet.
The FPGA unit can comprise: the message receiver module, receive message from processor unit, Ethernet switching chip or WAN port, and message is carried out data sync and converts the parallel data message into, and the parallel data message of storage conversion; The packet parsing module reads the parallel data message from Ethernet switching chip or WAN port, and the parallel data message is resolved to extract five-tuple; The Hash lookup module uses the five-tuple that extracts to calculate Hash ID through hash algorithm, obtains Hash table according to Hash ID, and the corresponding list item of five-tuple of in Hash table, searching and extracting; Packet forwarding module; When the Hash lookup module searches to the corresponding list item of five-tuple that extracts the time; Packet forwarding module is according to the corresponding list item of the five-tuple of parallel data message the parallel data message being encapsulated in the Hash table; And the parallel data message of encapsulation sent to the message sending module, when the corresponding list item of five-tuple that the Hash lookup module does not find and extracts, packet forwarding module directly sends to the message sending module with the parallel data message; The message sending module converts the parallel data message that encapsulates serial data into and sends to Ethernet switching chip or WAN port, and the parallel data message is sent to processor unit; Study and forwarding module read the parallel data message of the encapsulation of from processor unit, send it to the message sending module, and create the hash table about the parallel data message of encapsulation.
When hash-collision took place, study and forwarding module also can upgrade the hash table about the parallel data message that encapsulates.
Also can comprise the creation-time item in each list item of Hash table; When hash-collision takes place when; If the value of the creation-time item of current list item is greater than predetermined update time, then study and forwarding module can write current list item with the five-tuple of the parallel data message of current encapsulation.
Also can comprise the ageing time item in each list item of Hash table, when hash-collision takes place, if the value of the creation-time item of certain list item and the difference of current time greater than the value of ageing time item, are then learnt and forwarding module can be with said certain list item deletion.
Will be in ensuing description part set forth the present invention other aspect and/or advantage, some will be clearly through describing, and perhaps can pass through enforcement of the present invention and learn.
Description of drawings
Through the detailed description of carrying out below in conjunction with accompanying drawing, above and other objects of the present invention and characteristics will become apparent, wherein:
Fig. 1 illustrates the block diagram of the quick repeater system of CAPWAP message according to an exemplary embodiment of the present invention;
Fig. 2 illustrates the block diagram of the FPGA unit of the quick repeater system of CAPWAP message according to an exemplary embodiment of the present invention;
Embodiment
Now, describe exemplary embodiment of the present invention in detail, its example representes that in the accompanying drawings wherein, identical label is represented identical parts all the time.
Fig. 1 illustrates the block diagram of the quick repeater system of CAPWAP message according to an exemplary embodiment of the present invention.
As shown in Figure 1, the quick repeater system of CAPWAP message can comprise processor unit 110, FPGA unit 120, Ethernet switching chip 130 and wide area network (WAN) port one 40 according to an exemplary embodiment of the present invention.
The message that receives from Ethernet switching chip 130 or WAN port 140 by FPGA unit 120 can be divided into from AP CAPWAP (CAPWAP from AP) message or from two types of IP (the IP from Internet) messages of the Internet (Internet).For the message of CAPWAP from AP type, do not find and to comprise with the corresponding list item of the five-tuple of message and can not obtain that five-tuple, five-tuple are searched failure, message need be recombinated or message right and wrong CAPWAP message.For the message of IP from Internet type, do not find and to comprise with the corresponding list item of the five-tuple of message and can not obtain that five-tuple, five-tuple are searched failure or message needs burst.
WAN port 140 connects outer net, is used for message is sent to FPGA unit 120 or the 120 reception messages from the FPGA unit.
Ethernet switching chip 130 is used for message is sent to FPGA unit 120 or the 120 reception messages from the FPGA unit.Here, the ether swap operation of Ethernet switching chip 130 belongs to prior art in this area, for fear of fuzzy theme of the present invention, therefore is not described in detail at this.
To further describe the FPGA unit 120 of the quick repeater system of CAPWAP message shown in Fig. 1 below with reference to Fig. 2.
Fig. 2 illustrates the block diagram of the FPGA unit 120 of the quick repeater system of CAPWAP message according to an exemplary embodiment of the present invention.
With reference to Fig. 2, the FPGA unit can comprise message receiver module 210, packet parsing module 220, Hash lookup module 230, packet forwarding module 240, message sending module 250 and study and forwarding module 260 according to an exemplary embodiment of the present invention.
Message receiver module 210 receives message from processor unit 110, Ethernet switching chip 130 or WAN port 140, and message is carried out data sync and converts the parallel data message into, and the parallel data message of storage conversion.Here, only as an example, message receiver module 210 can convert message into 128 bit parallel data messages.
Packet parsing module 220 reads from Ethernet switching chip 130 or WAN port 140 and the parallel data message that obtains through data sync, conversion, and the parallel data message is resolved to extract five-tuple.Here, packet parsing module 220 can be grown up bag in 1900 bytes or less than the packet loss of 60 bytes, and can the five-tuple that extract be cached in the fifo buffer (FIFO).In addition,, can extract five-tuple,, can extract five-tuple from the IP head for the message of IP from Internet type from internal layer IP head for the message of CAPWAP from AP type.
Hash lookup module 230 uses the five-tuple that extracts to calculate Hash ID through hash algorithm, obtains Hash table according to Hash ID, and in Hash table, searches the corresponding list item of five-tuple with the extraction of parallel data message.Here, Hash ID is the memory address with the Hash table of searching.In addition, only as an example, each list item of Hash table can comprise: five-tuple, 802.3 frame heads, VLAN OUT, VLAN IN, IP heading, UDP heading, CAPWAP heading, 802.11 frame heads.
If Hash lookup module 230 find with the corresponding list item of five-tuple of the extraction of parallel data message (promptly; The Hash coupling); Then packet forwarding module 240 is according to encapsulating the parallel data message with the corresponding list item of the five-tuple of parallel data message in the Hash table, and the parallel data message of encapsulation is sent to message sending module 250; Otherwise packet forwarding module 240 directly sends to message sending module 250 with the parallel data message.Here; Packet forwarding module 240 can be supported the forwarding of four kinds of patterns; That is, Internet to Internet (Internet to Internet), AP to Internet (AP to Internet), AP to AP (AP to AP), Internet to AP (Internet to AP).For the message of to Internet, the encapsulation operation of packet forwarding module 240 can comprise remove outer encapsulation, add 802.3 frame heads, with the TTL in the IP heading subtract 1 and recomputate verification and.Message for to AP; The encapsulation operation of packet forwarding module 240 can comprise adding successively perhaps upgrades LLC/SNAP head, 802.11 frame heads, CAPWAP head, UDP head, IP heading, 802.3 frame heads; The TTL of IP heading is subtracted 1, recomputate verification with, fragment (Fragment) ID of outer IP heading is increased progressively; The FragmentID of CAPWAP head is increased progressively, sequence (sequence) ID of 802.11 frame heads is increased progressively.In addition, the configuration of the QOS_EN when packet forwarding module 240 is supported to transfer out soon simultaneously, QOS_EN is 1 o'clock, and 802.11 frame heads of output are 28 bytes of band QOS information, and QOS_EN is 0 o'clock, and 802.11 frame heads of output are not for 24 bytes of QOS information.Should be appreciated that the concrete forwarding of above-mentioned message and encapsulation operation only are examples, those skilled in the art can make a change above-mentioned concrete forwarding operation fully according to actual needs.
Message sending module 250 converts the parallel data message of encapsulation into the serial data message, and sends it to Ethernet switching chip 130 or WAN port 140 according to its encapsulation.In addition, message sending module 250 also can directly send to processor unit 110 with the parallel data message.
Study is read from processor unit 110 with forwarding module 260 and the parallel data message of the encapsulation that obtains through data sync, conversion, sends it to message sending module 250, and creates the hash table about the parallel data message that encapsulates.More specifically; FPGA unit 120 can be created in five-tuple, source MAC, the target MAC (Media Access Control) address of the parallel data message that encapsulates in the Hash table as new list item; But this only is an example, and those skilled in the art can change the content with the hash table of creating according to actual needs.
In addition, for two different five-tuples, if the Hash ID that calculates is identical; Then this situation is exactly a hash-collision, therefore, occupies the Hash table space for a long time for avoiding a kind of message; Also can upgrade, more specifically, can carry out following two kinds of processing: 1) in each list item of Hash table, comprise a creation-time item (setup_time) by study and 260 pairs of Hash tables of forwarding module; When hash-collision takes place, when hash-collision takes place, if the value of the setup_time of current list item is greater than predetermined update time (update_time); Then current list item is upgraded, write 7 five-tuples of the parallel data message of current encapsulation; 2) aging polling mechanism is set, that is, regularly Hash table is worn out (deletion), specifically, in each list item of Hash table, comprise an ageing time item (aging_time).When hash-collision takes place, if the difference of the value of the setup_time of certain list item and current time is greater than the value of aging_time, then with said certain list item deletion.
In addition; As optional module; FPGA unit 120 also can comprise memory module, is used to store Hash table and by the parallel data message of message receiver module 210 conversions, and perhaps each module of FPGA unit 120 is addressable or read Hash table and the parallel data message that is stored in the external memory storage.
Should understand; Each module that FPGA unit shown in Fig. 2 comprises only is an example; Those skilled in the art can carry out function to each module according to actual needs fully and split or make up; Such as, can use a module to realize the function etc. of message receiver module 210 and packet parsing module 220, repeat no more at this.
According to exemplary embodiment of the present invention; In the FPGA unit, adopted The pipeline design; The data flow of message is a way flow that does not have feedback; The output of previous step is the input of a back step, so can improve the operating frequency of system, this is a kind of imbody that area exchanges speed for.In addition, the FPGA unit further realizes many pipeline parallel methods processing, improves the CAPWAP message forwarding performance greatly, supports the linear speed exchange capacity of 30G data traffic, and length is that the following message of 256 bytes also can reach surface speed forwarding.Since used FPGA, more convenient in debugging, and have compatibility and scalability preferably.
Though illustrated and described the present invention with reference to certain exemplary embodiments; But it will be apparent to one skilled in the art that under the situation that does not break away from the spirit and scope of the present invention that scope limits claim and equivalent thereof and can make the various changes on form and the details.
Claims (8)
1. the quick repeater system of the control of a WAP and configuration (CAPWAP) message comprises:
Ethernet switching chip;
Wide area network (WAN) port;
Field programmable gate array (FPGA) unit; Be used for receiving message, and from Hash table, search and the corresponding list item of the five-tuple of message, if do not find corresponding list item from Ethernet switching chip or WAN port; Then message is sent to processor unit; Receive the message of encapsulation and send to Ethernet switching chip unit or WAN port from processor unit subsequently, and in Hash table, set up and the corresponding new list item of the five-tuple of the message that encapsulates, if find corresponding list item; Then message is encapsulated, and the message of encapsulation is sent to Ethernet switching chip unit or WAN port according to the list item that finds;
Processor unit is used for the message that the FPGA unit sends is encapsulated, and the message of encapsulation is sent to the FPGA unit.
2. the quick repeater system of CAPWAP message as claimed in claim 1, wherein, the five-tuple of message comprises the source IP address of message, purpose IP address, source port number, destination slogan and IP agreement.
3. the quick repeater system of CAPWAP message as claimed in claim 1, wherein, each list item of Hash table comprises five-tuple and source MAC, the target MAC (Media Access Control) address of message.
4. the quick repeater system of CAPWAP message as claimed in claim 1, wherein,
For CAPWAP message, do not find and comprise with the corresponding list item of the five-tuple of message and can not obtain that five-tuple, five-tuple are searched failure, message need be recombinated or message right and wrong CAPWAP message from WAP (AP);
For IP message, do not find and comprise with the corresponding list item of the five-tuple of message and can not obtain that five-tuple, five-tuple are searched failure or message needs burst from the Internet.
5. like the quick repeater system of the described CAPWAP message of one of claim 1～4, wherein, the FPGA unit comprises:
The message receiver module receives message from processor unit, Ethernet switching chip or WAN port, and message is carried out data sync and converts the parallel data message into, and the parallel data message of storage conversion;
The packet parsing module reads the parallel data message from Ethernet switching chip or WAN port, and the parallel data message is resolved to extract five-tuple;
The Hash lookup module uses the five-tuple that extracts to calculate Hash ID through hash algorithm, obtains Hash table according to Hash ID, and the corresponding list item of five-tuple of in Hash table, searching and extracting;
Packet forwarding module; When the Hash lookup module searches to the corresponding list item of five-tuple that extracts the time; Packet forwarding module is according to the corresponding list item of the five-tuple of parallel data message the parallel data message being encapsulated in the Hash table; And the parallel data message of encapsulation sent to the message sending module, when the corresponding list item of five-tuple that the Hash lookup module does not find and extracts, packet forwarding module directly sends to the message sending module with the parallel data message;
The message sending module converts the parallel data message that encapsulates serial data into and sends to Ethernet switching chip or WAN port, and the parallel data message is sent to processor unit;
Study and forwarding module read the parallel data message of the encapsulation of from processor unit, send it to the message sending module, and create the hash table about the parallel data message of encapsulation.
6. the quick repeater system of CAPWAP message as claimed in claim 5, wherein, when hash-collision took place, study and forwarding module also upgraded the hash table about the parallel data message that encapsulates.
7. the quick repeater system of CAPWAP message as claimed in claim 6; Wherein, Also comprise the creation-time item in each list item of Hash table; When hash-collision takes place when, if the value of the creation-time item of current list item greater than predetermined update time, then study and forwarding module write current list item with the five-tuple of the parallel data message of current encapsulation.
8. the quick repeater system of CAPWAP message as claimed in claim 7; Wherein, Also comprise the ageing time item in each list item of Hash table; When hash-collision takes place, if the value of the creation-time item of certain list item and the difference of current time greater than the value of ageing time item, are then learnt and forwarding module is deleted said certain list item.
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| CN110505161A (en) * | 2019-09-24 | 2019-11-26 | 杭州迪普科技股份有限公司 | A kind of message processing method and equipment |
| CN111614793A (en) * | 2020-04-22 | 2020-09-01 | 上海御渡半导体科技有限公司 | FPGA-based Ethernet switch MAC address management device and method |
| CN111614793B (en) * | 2020-04-22 | 2022-03-04 | 上海御渡半导体科技有限公司 | FPGA-based Ethernet switch MAC address management device and method |
| CN112737914A (en) * | 2020-12-28 | 2021-04-30 | 北京天融信网络安全技术有限公司 | Message processing method and device, network equipment and readable storage medium |
| CN112737914B (en) * | 2020-12-28 | 2022-08-05 | 北京天融信网络安全技术有限公司 | Message processing method and device, network equipment and readable storage medium |
| CN112769701A (en) * | 2020-12-30 | 2021-05-07 | 杭州迪普信息技术有限公司 | Method and device for forwarding message |
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