CN103546386A - Method and system for flow control over data message sent by router - Google Patents

Method and system for flow control over data message sent by router Download PDF

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Publication number
CN103546386A
CN103546386A CN201310506860.8A CN201310506860A CN103546386A CN 103546386 A CN103546386 A CN 103546386A CN 201310506860 A CN201310506860 A CN 201310506860A CN 103546386 A CN103546386 A CN 103546386A
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data
message
flow control
card
line card
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何三波
曾健
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Maipu Communication Technology Co Ltd
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Maipu Communication Technology Co Ltd
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Abstract

The invention discloses a method and system for flow control over a data message sent by a router. The method mainly comprises the following steps: a flow control mark variable is set in an internal storage connected with a CPU of a data card; a message forwarding unit reads the flow control mark variable in the internal storage and processes the data message according to the status of the flow control mark variable; a message receiving unit on a line card receives the data message sent by the data card and forwards the data message to a message sending unit on the line card; the message sending unit on the line card processes the data message according to the situation of whether a wide area network interface is blocked, and sets the flow control mark variable in the internal storage of the data card through a PCI-E channel between the data card and the line card. Since the flow control mark variable in the data card is set through the PCI-E channel, flow control processing is simpler in process and shorter in time, and the flow control effect is better.

Description

Flow control method and system that in router, data message sends
Technical field
The invention belongs to data communication technology field, relate to a kind of flow control method and system of data message, the flow control method that specifically in a kind of router, data message sends and the design of system.
Background technology
When multi-core CPUs (Central Processing Unit, central processing unit) such as using cavium, tilera is made the data card processor of router, the hardware-accelerated parts of these multi-core CPUs are only supported Ethernet interface, and do not support Wide Area Network interface.In order to solve hardware-accelerated parts, support Wide Area Network interface, can on non-ether line card, use FPGA (FPGA:Filed-Programmable Gate Array, field programmable gate array) or CPU to carry out with the conversion between the non-ether in Taihe county.
Due to not mating of the bandwidth between Wide Area Network interface on line card and the Ethernet interface of data card, for example the bandwidth of the Ethernet interface on multi-core CPU is the first parameter value 000Mbps, and Wide Area Network interface on line card (comprises POS(Packet Over SDH, use the technology of light transmission IP message) mouthful, E1 interface, synchronous and asynchronous interface etc.) if pos interface speed is the first parameter value 55Mbps, when multi-core CPU sends message with the speed of 1000M to the Wide Area Network interface of 155M, on line card, the Wide Area Network interface of 155M will inevitably be lost message, owing to there is no software QOS(Quality Of Service on line card) carry out the discard processing of message, may be dropped by important message like this, inessential message is not dropped on the contrary.
In order to solve the unmatched line card that causes of bandwidth, send this problem of report lost literary composition, existing processing method is, on line card, FPGA or CPU receive after the message of data card transmission, to Wide Area Network interface, send message, if Wide Area Network interface sends while blocking, to data card, send Flow Control message, data card receives after Flow Control message, Flow Control is set and is masked as obstruction.Data processing unit on data card detects after Flow Control sign, notice upper layer software (applications) module, upper layer software (applications) module is taked certain strategy to process and is sent message, for example abandon the message of low priority as far as possible, buffer memory high priority message, on line card, FPGA or CPU detect Wide Area Network interface and send while not blocking and to data card, send and separate Flow Control message, and data card receives while separating Flow Control message, Flow Control is set and is masked as unblock, the data processing unit on data card restarts to send.
But the weak point of the method is: it is long to the time between data card processing Flow Control message that the FPGA on line card or CPU send Flow Control message reconciliation Flow Control message to data card, causes the effect of Flow Control not ideal enough.
Summary of the invention
Technical problem to be solved by this invention is to produce in order to overcome line card in prior art flow control method and the system that Flow Control message and transmission Flow Control message and data card are processed the long problem of time of Flow Control message and data message transmission in a kind of router is provided.
The technical scheme that the present invention solves its technical problem employing is: the flow control method that in router, data message sends, comprises the steps:
In A, the internal memory that connects at the CPU of data card, Flow Control indexed variable is set, described Flow Control indexed variable represents the transmission state of the Wide Area Network interface data message on line card;
Message repeating unit in B, data card read the Flow Control indexed variable in internal memory before sending datagram, according to the state processing data message of Flow Control indexed variable;
Message receiving element on C, line card receives the data message sending on data card, and is forwarded to the packet sending unit on line card;
Whether the packet sending unit on D, line card blocks deal with data message according to Wide Area Network interface, and by the Flow Control indexed variable in the internal memory of the PCI-E channel setting data card between data card and line card.
Further, when the value of described Flow Control indexed variable is the first parameter value, represent that the state that the Wide Area Network interface on line card sends datagram is obstruction; When the value of Flow Control marking variable is the second parameter value, the state that the Wide Area Network interface on expression line card sends datagram is not for blocking.
Further, in described step B, if the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the first parameter value, message repeating unit does not send this data message, and to upper strata message process unit, reply to send and block sign, by upper strata message process unit, described data message is processed; If the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the second parameter value, the Ethernet interface of this data message from data card sends to the Ethernet interface of line card.
Further, upper strata message process unit is to abandon rudimentary message, the senior message of buffer memory to the processing mode of data message.
Further, in described step C, the message receiving element in line card receives after data message, first data message is sent to the buffer queue of packet sending unit, and activates packet sending unit.
Further, in described step D, packet sending unit first detects the transmission state of the Wide Area Network interface data message on line card, if transmission state blocks, do not send datagram, and be the first parameter value by the value of the Flow Control indexed variable in the PCI-E between data card and line card (Peripheral Component Interconnect Express, peripheral element expansion interface) channel setting data card;
If transmission state does not block, packet sending unit is taken out a data message and is sent from buffer queue, and is the second parameter value by the value of the Flow Control indexed variable in the PCI-E channel setting data card between data card and line card.
The flow control system that the present invention also provides data message in a kind of router to send for technical solution problem, specifically comprise CPU in data card, be connected in the internal memory of CPU, and the Ethernet interface on data card and PCI-E data-interface, the CPU in line card and the Ethernet interface on line card, Wide Area Network interface and PCI-E data-interface; PCI-E data-interface on data card and the PCI-E data-interface on line card form PCI-E data channel;
CPU in described data card comprises message repeating unit, described message repeating unit is for sending datagram to the Ethernet interface on line card by the Ethernet interface on data card, the internal memory of the described CPU of being connected in is for Flow Control indexed variable is set, and described Flow Control indexed variable is for representing the state that the Wide Area Network interface on line card sends datagram;
CPU in described line card comprises message receiving element and packet sending unit, described message receiving element is for receiving the data message sending on data card and being forwarded to packet sending unit, described packet sending unit is for the data message of reception is sent to Wide Area Network interface, and the state sending datagram according to Wide Area Network interface arranges the Flow Control indexed variable of internal memory in data card by PCI-E data channel.
Further, when the Flow Control indexed variable of described internal memory is the first parameter value, represent that the state that the Wide Area Network interface on line card sends datagram is obstruction; When Flow Control marking variable is the second parameter value, the state that the Wide Area Network interface on expression line card sends datagram is not for blocking.
Further, if the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the first parameter value, message repeating unit does not send this data message, and to upper strata message process unit, reply to send and block sign, by upper strata message process unit, described data message is processed; If the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the second parameter value, the Ethernet interface of this data message from data card sends to the Ethernet interface of line card.
Beneficial effect of the present invention: flow control method and system that in router of the present invention, data message sends, by adopting PCI-E data channel that the Flow Control indexed variable in data card is set, replaced prior art and produced Flow Control message and sent the state that Flow Control message informs that the Wide Area Network interface on the data message transmitting element line card of data card sends datagram by line card, the flow process that Flow Control is processed is simpler; And data card reads described Flow Control indexed variable at the Shi Douhui that need to send datagram at every turn, and the time that line card arranges Flow Control indexed variable is shorter, and the fluid control effect reaching can be better.
Accompanying drawing explanation
Figure 1 shows that the FB(flow block) of the flow control method that in the router of the embodiment of the present invention, data message sends;
Figure 2 shows that the structured flowchart of the flow control system that in the router of the embodiment of the present invention, data message sends;
The flow control system figure that on Fig. 3 line card, the data message of a plurality of Wide Area Network interface sends.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the invention will be further elaborated.
The FB(flow block) that is illustrated in figure 1 the flow control method that in the router of the embodiment of the present invention, data message sends, it specifically comprises the steps:
In A, the internal memory that connects at the CPU of data card, Flow Control indexed variable is set, described Flow Control indexed variable represents the transmission state of the Wide Area Network interface data message on line card;
Message repeating unit in B, data card read the Flow Control indexed variable in internal memory before sending datagram, according to the state processing data message of Flow Control indexed variable;
Message receiving element on C, line card receives the data message sending on data card, and is forwarded to the packet sending unit on line card;
Whether the packet sending unit on D, line card blocks deal with data message according to Wide Area Network interface, and by the Flow Control indexed variable in the internal memory of the PCI-E channel setting data card between data card and line card.
Wherein, because the Ethernet interface on data card can not directly carry out data communication by the Wide Area Network interface directly and on line card, must rely on Ethernet interface on line card to carry out data retransmission and could realize communication between the two, the transmission of wish data message between data card and line card is that the Gigabit EtherChannel consisting of both Ethernet interface sends.
The flow control method of prior art is the transmission state of the Wide Area Network interface data message of data card message repeating unit on line card of informing by sending Flow Control message, thereby the data message that needs are sent is processed accordingly, avoid important message dropping, yet the drawback that adopts Flow Control message mode is longer in the time that produces Flow Control message and processing Flow Control message, thereby has caused fluid control effect not ideal enough; The improvement that the present invention makes is that multi-core CPU connects on data card internal memory is (as DDR, Double Data Rate Synchronous Dynamic Random Access Memory, Double Data Rate synchronous DRAM) in, distribute a region, can be that the distribution such as 1 byte, 2 bytes or 4 bytes are as representing that the state that on line card, Wide Area Network interface sends is the Flow Control indexed variable that blocks or do not block, when the value of described Flow Control indexed variable is the first parameter value, represent that the state that the Wide Area Network interface on line card sends datagram is obstruction; When the value of Flow Control marking variable is the second parameter value, the state that the Wide Area Network interface on expression line card sends datagram is not for blocking.Those skilled in the art are easy to the first parameter value and the second parameter value to arrange, as are set to 1 and 0, or other two parameters that represent mutual exclusion can.Flow Control indexed variable is carried out write operation by line card by PCI-E, and on data card, message retransmission unit carries out read operation.
In described step B, if the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the first parameter value, message repeating unit does not send this data message, and to upper strata message process unit, reply to send and block sign, by upper strata message process unit, according to actual conditions, adopt certain strategy to process described data message, its processing mode can be for abandoning priority packet, and the message of high priority is carried out to buffer memory; If the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the second parameter value, the Ethernet interface of this data message from data card sends to the Ethernet interface of line card.
When the data message on data card sends on line card, the processing of data message is mainly completed by message receiving element and packet sending unit.Message receiving element in line card receives after data message, first data message is sent to the buffer queue of packet sending unit, and activates packet sending unit.Packet sending unit first detects the transmission state of the Wide Area Network interface data message on line card, if transmission state blocks, do not send datagram, and be the first parameter value by the value of the Flow Control indexed variable in the PCI-E channel setting data card between data card and line card; If transmission state does not block, packet sending unit is taken out a data message and is sent from buffer queue, and is the second parameter value by the value of the Flow Control indexed variable in the PCI-E channel setting data card between data card and line card.
Simultaneously, the present invention also provides the flow control system that in a kind of router, data message sends, be illustrated in figure 2 the structured flowchart of this system, specifically comprise CPU in data card, be connected in the internal memory of CPU, and the Ethernet interface on data card and PCI-E data-interface, the CPU in line card and the Ethernet interface on line card, Wide Area Network interface and PCI-E data-interface; PCI-E data-interface on data card and the PCI-E data-interface on line card form PCI-E data channel;
CPU in described data card comprises message repeating unit, described message repeating unit is for sending datagram to the Ethernet interface on line card by the Ethernet interface on data card, the internal memory of the described CPU of being connected in is for Flow Control indexed variable is set, and described Flow Control indexed variable is for representing the state that the Wide Area Network interface on line card sends datagram;
CPU in described line card comprises message receiving element and packet sending unit, described message receiving element is for receiving the data message sending on data card and being forwarded to packet sending unit, described packet sending unit is for the data message of reception is sent to Wide Area Network interface, and the state sending datagram according to Wide Area Network interface arranges the Flow Control indexed variable of internal memory in data card by PCI-E data channel.
Wherein, when the Flow Control indexed variable of described internal memory is the first parameter value, represent that the state that the Wide Area Network interface on line card sends datagram is obstruction; When Flow Control marking variable is the second parameter value, the state that the Wide Area Network interface on expression line card sends datagram is not for blocking.If the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the first parameter value, message repeating unit does not send this data message, and to upper strata message process unit, reply to send and block sign, by upper strata message process unit, described data message is processed; If the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the second parameter value, the Ethernet interface of this data message from data card sends to the Ethernet interface of line card.
In the present invention, the method for data message Flow Control is also applicable to the situation of a plurality of Wide Area Network interface on line card.On line card, under the situation of a plurality of Wide Area Network interface, only need on data card, distribute a region of memory, in this piece region of memory, mark off the Flow Control indexed variable of corresponding a plurality of Wide Area Network interface.Being illustrated in figure 3 line card has the flow control system block diagram of 3 Wide Area Network interface, message repeating unit in data card is when the data message to line card transmission interface i (i=1,2,3), need to read Flow Control indexed variable i (i=1,2,3), if Flow Control indexed variable i is (i=1,2,3) be the first parameter value, upper strata message process unit is replied to send and is blocked sign, by upper strata message process unit, described data message is processed.Message receiving element in line card receives data card and is dealt into after interface i (i=1,2,3) data message, first data message is sent to the buffer queue of the packet sending unit of interface i (i=1,2,3), and activation interface i (i=1,2,3) packet sending unit; Packet sending unit first detects the interface i (i=1 on line card, 2,3) the transmission state of data message, if transmission state blocks, do not send datagram, and be the first parameter value by the value of the Flow Control indexed variable i (i=1,2,3) in the PCI-E channel setting data card between data card and line card; If transmission state does not block, packet sending unit is from interface i (i=1,2,3) in buffer queue, taking out a data message sends, and by the Flow Control indexed variable i (i=1 in the PCI-E channel setting data card between data card and line card, 2,3) value is the second parameter value.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not depart from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.

Claims (10)

1. the flow control method that in router, data message sends, is characterized in that, comprises the steps:
In A, the internal memory that connects at the central processor CPU of data card, Flow Control indexed variable is set, described Flow Control indexed variable represents the transmission state of the Wide Area Network interface data message on line card;
Message repeating unit in B, data card read the Flow Control indexed variable in internal memory before sending datagram, according to the state processing data message of Flow Control indexed variable;
Message receiving element on C, line card receives the data message sending on data card, and is forwarded to the packet sending unit on line card;
Whether the packet sending unit on D, line card blocks deal with data message according to Wide Area Network interface, and by the Flow Control indexed variable in the internal memory of the PCI-E channel setting data card between data card and line card.
2. the method for claim 1, is characterized in that, when the value of described Flow Control indexed variable is the first parameter value, represents that the state that the Wide Area Network interface on line card sends datagram is obstruction; When the value of Flow Control marking variable is the second parameter value, the state that the Wide Area Network interface on expression line card sends datagram is not for blocking.
3. method as claimed in claim 2, it is characterized in that, in described step B, if the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the first parameter value, message repeating unit does not send this data message, and to upper strata message process unit, reply to send and block sign, by upper strata message process unit, described data message is processed; If the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the second parameter value, the Ethernet interface of this data message from data card sends to the Ethernet interface of line card.
4. method as claimed in claim 3, is characterized in that, upper strata message process unit is to abandon rudimentary message, the senior message of buffer memory to the processing mode of data message.
5. the method as described in claim 1 to 4 any one, is characterized in that, in described step C, the message receiving element in line card receives after data message, first data message is sent to the buffer queue of packet sending unit, and activates packet sending unit.
6. the method as described in claim 1 to 4 any one, it is characterized in that, in described step D, packet sending unit first detects the transmission state of the Wide Area Network interface data message on line card, if transmission state blocks, do not send datagram, and be the first parameter value by the value of the Flow Control indexed variable in the PCI-E channel setting data card between data card and line card;
If transmission state does not block, packet sending unit is taken out a data message and is sent from buffer queue, and is the second parameter value by the value of the Flow Control indexed variable in the PCI-E channel setting data card between data card and line card.
7. the flow control system that in router, data message sends, it is characterized in that, specifically comprise CPU in data card, be connected in the internal memory of CPU, and the Ethernet interface on data card and peripheral element expansion interface PCI-E, the CPU in line card and the Ethernet interface on line card, Wide Area Network interface and PCI-E data-interface; PCI-E data-interface on data card and the PCI-E data-interface on line card form PCI-E data channel;
CPU in described data card comprises message repeating unit, described message repeating unit is for sending datagram to the Ethernet interface on line card by the Ethernet interface on data card, the internal memory of the described CPU of being connected in is for Flow Control indexed variable is set, and described Flow Control indexed variable is for representing the state that the Wide Area Network interface on line card sends datagram;
CPU in described line card comprises message receiving element and packet sending unit, described message receiving element is for receiving the data message sending on data card and being forwarded to packet sending unit, described packet sending unit is for the data message of reception is sent to Wide Area Network interface, and the state sending datagram according to Wide Area Network interface arranges the Flow Control indexed variable of internal memory in data card by PCI-E data channel.
8. system as claimed in claim 7, is characterized in that, when the Flow Control indexed variable of described internal memory is the first parameter value, represents that the state that the Wide Area Network interface on line card sends datagram is obstruction; When Flow Control marking variable is the second parameter value, the state that the Wide Area Network interface on expression line card sends datagram is not for blocking.
9. system as claimed in claim 8, it is characterized in that, if the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the first parameter value, message repeating unit does not send this data message, and to upper strata message process unit, reply to send and block sign, by upper strata message process unit, described data message is processed; If the message repeating unit in data card reads the value of the Flow Control indexed variable in internal memory while being the second parameter value, the Ethernet interface of this data message from data card sends to the Ethernet interface of line card.
10. system as claimed in claim 9, it is characterized in that, described packet sending unit first detects the transmission state of the Wide Area Network interface data message on line card, if transmission state blocks, do not send datagram, and be the first parameter value by the value of the Flow Control indexed variable in the PCI-E channel setting data card between data card and line card;
If transmission state does not block, packet sending unit is taken out a data message and is sent from buffer queue, and is the second parameter value by the value of the Flow Control indexed variable in the PCI-E channel setting data card between data card and line card.
CN201310506860.8A 2013-10-24 2013-10-24 Method and system for flow control over data message sent by router Pending CN103546386A (en)

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