CN1165142C - Ouput quene method and device of network data packets - Google Patents
Ouput quene method and device of network data packets Download PDFInfo
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- CN1165142C CN1165142C CNB011167947A CN01116794A CN1165142C CN 1165142 C CN1165142 C CN 1165142C CN B011167947 A CNB011167947 A CN B011167947A CN 01116794 A CN01116794 A CN 01116794A CN 1165142 C CN1165142 C CN 1165142C
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Abstract
The present invention relates to an output queue method and a device of network data packets. A broadcast data packet is processed by an additional broadcast output queue. A node corresponding to each port in the output queue is only used for processing a single-cast type data packet. After the broadcast data packet enters, a memory only allocates a link node for the broadcast output queue. Meanwhile, the number of broadcast data packets to be sent out is recorded on the last node in the output queue corresponding to each port. After one port sends out the single-cast type data packet corresponding to the node point on the output queue, if the count value of the broadcast data packet is read about, the broadcast output queue is pointed, and the corresponding broadcast data packet is read and sent out.
Description
Technical field
The present invention relates to a kind of network technology, particularly relate to a kind of data transmission method of switching network, and the device of adopting said method.
Background technology
Network system is made up of many framework pieces (building block).These pieces comprise hub (hub), bridger (bridge), router (router), network card, user computer, servo host, transmission medium connecting device and network management software or the like.Wherein hub is exactly the concentrated place that a group user connects to network, and it comprises free-standing trunk concentrator (standalone repeating hub), Stackable hub (stackable hub) and switch hub (switching hub).Switch hub, generally speaking, wherein a port (port) temporarily stores received packet (packet) or is called frame (frame), sends packet by the another port more afterwards, and this kind mode is called the storage back and carries (store-and-forward).The size of a packet can be 64 bytes, and (byte is B) to 1518 bytes.For an Ethernet (ethernet), three kinds of different packets (or grouping) kenel is arranged: broadcast-type packet (broadcast packet), multicast type packet (multicast packet) and clean culture type packet (unicast packet).When a packet from switch hub send this packet from remaining port after wherein a port is sent to, the packet of this type is referred to as the broadcast-type packet.By after wherein a port is sent to of switch hub, from wherein several packets of sending of all the other ports, this kind is called multicast type packet again.Clean culture type packet then is sent to the port of another appointment from a port.
Be the example explanation with switch hub below, and the speed that spreads out of of each port is 100Mbps (mega byte per second) with 16 ports.Please refer to Fig. 1, the core of switch hub is made up of exchange control chip (a switching IC) 100, in order to the transmission of control data bag.The exchange control chip is couple to a static RAM (static ranom access memory, SRAM) 110 and one synchronous dynamic random access memory (synchrotron dynamic randomaccess memory, SDRAM) 120 again.Please refer to Fig. 2, in SRAM110, main link nodes (the link node of free lists) part 114 of passing on table (forward table) part 112, not using tabulation that stores, it comprises the link nodes 114a that several do not use tabulation, and attribute item (attribute entry) part 116, it is made of several attribute items 116a.The port of the address, source of each packet of the table 112 that passes on record and the port that will be transferred to number.Each port has an output queue (ouputqueue).To when sending, this port can never use link nodes part 114 configurations one of tabulation to use the link nodes 114a of tabulation to give output queue 130 as a packet, as shown in Figure 3A, and as link nodes 114a '.The link nodes 114a that does not use tabulation that is disposed at output queue 130 is used for keeping in and will sends the related data of a packet from this port.Fig. 3 A is pictured in a certain port and has three link nodes 114a '.Each output queue all has two pointers: first H of formation (head) and rear of queue T (tail), it is used to refer to respectively and corresponds to first packet information that will be transmitted and corresponding last packet information that will be transmitted.
With reference to figure 3B, it illustrates the form of the link nodes 114a ' of output queue 130, and its size is 64.As shown in the figure, the 0th is release mark (drop flag), and being used for indicating this link nodes is to belong in the use or not use.The the 1st to the 16th is a pointer (pointer), is used to refer to the address of next link nodes.The 17th then is used for indicating the pairing type of data packet of this link nodes 114a '.The the 18th to the 33rd is another pointer, is used to refer to the address of packet buffer (packet buffer).
SDRAM memory 120 (with reference to figure 1) is that a unit is divided into several blocks 122 with memory 120 with 15KB, and each block is used for as a packet working area 122.Whether simultaneously, each attribute item 116a of the attribute item parts 116 in SRAM memory 110 (Fig. 1) all corresponds to a packet buffer 122, send out from a port in order to write down these packet buffer 122 stored packets.Fig. 3 C shows the form of this attribute item 116a.The the 0th to 15 of attribute item 116a is a pointer, is used to refer to next address of not using the link nodes of tabulation.The the 16th to 32 is port mask (port mask).All the other positions (33～63) then keep.
Generally speaking, the data of network transmit the rule that need satisfy first in first out; That is the packet of delivering to earlier will be sent out earlier.Yet, under above-mentioned existing framework, after a broadcast data packet is sent to from a port (for example port 0), another packet is arranged again, as a clean culture type packet, to be sent to another port (for example port one) from a port (for example port one 2).In the case, transmit the rule of first in first out in order to guarantee data, existing way is complexity and inefficiency very.Please refer to Fig. 4, the output queue of drawing port one among the figure has been gone here and there the link nodes U11～U16 of 6 clean culture type packets, port 2 has 2 clean culture type packet link nodes U21～U22, and port 3 has 9 link nodes U31～U39, for interest of clarity is saved port 4 to port one 5.Please cooperate Fig. 1, when a broadcast data packet when port 0 is sent to, SRAM memory 110 can 15 of configurations use the link nodes 114a of tabulation to give after each port one～15, becomes a broadcast-type packet link nodes B.Each broadcasting link Node B all can be pointed to the packet buffer 122 in the SDRAM memory 120, as the buffer of broadcast-type packet.This packet buffer 122 is corresponding with an attribute item 116a in the SRAM memory 110 again.Utilize the port mask among the attribute item 116a just can learn the transmission situation of each port to this broadcast data packet.Afterwards, at time t
2If another clean culture type packet is when port one 2 will be sent to port one, the output queue that SRAM memory 110 can 1 of configuration uses the link nodes 114a of tabulation to give port one.When time t6, because broadcast-type packet link nodes B, port one can be read corresponding this link nodes B from SDRAM memory 120 packet buffer 122 stored packets send out.Afterwards, port one just can be sent laggard clean culture type packet after the broadcast-type packet, to guarantee the rule of data packet first in first out.By the time after this broadcast-type packet was sent from each port, the SRAM memory just discharged 15 link nodes and the attribute item that this broadcast data packet is given in configuration.
By above-mentioned described, to being sent fully by all the other each ports, the number of times of its access SRAM is very frequent after a broadcast-type packet is sent to from a port.At first just must 15 of configurations not use the link nodes of tabulation to give output queue, this measure just needs access SRAM memory 15 times.Then, again these 15 link nodes strings rows (enqueue) after the output queue of each port, with must access SRAM memory 15 times.After broadcast data packet is sent fully, and need output queue uplink node is removed (dequeue) and discharged this 15 link nodes, it wants 15 SRAM memories of access respectively.So just necessary altogether access SRAM memory is up to 60 times.
Secondly, the output queue that the link nodes of tabulation is given each port is not used in 15 of the just necessary configurations of the transmission of every once broadcast data packet.Therefore, if when having a plurality of broadcast data packet to transmit, just need jumbo SRAM memory.In addition, SRAM also wants the attribute item of configuration data pack buffer to write down the delivery status of each port data bag, and this can take the capacity of SRAM memory again.Simultaneously, the SRAM memory also must be safeguarded many extra link nodes of not using tabulation to correspond to actual needs, the situation that for example above-mentioned a plurality of broadcast data packet will transmit.It is very inefficent that this logarithm reportedly send.
Summary of the invention
Therefore the present invention proposes a kind of switching network output queue method, and the number of times of its access memory is few far beyond existing.
The present invention proposes a kind of output queue method of network packet, its needn't be in memory the attribute item parts of configuration data pack buffer, the utilization of memory has more elasticity.
The present invention proposes a kind of output queue method of network packet, and it needn't also can handle the situation that a plurality of broadcast data packet are sent switching hub to by mass storage.
The present invention proposes a kind of output queue method of network packet, and it is summarized as follows:
A kind of output queue method of network packet is applied to have the switch type data packet transmission device of most ports, and it comprises: receive a packet, and the form of judgment data bag is clean culture type packet or broadcast-type packet.When packet is clean culture type packet, give an output queue from SRAM memory configurations one first link nodes, aforesaid output queue corresponds to the port wherein that will send this clean culture type packet.When packet is a broadcast-type packet, to a broadcasting output queue (broadcast output queue), simultaneously the broadcast data packet count value (broadcast count) in last first link nodes in each output queue of corresponding each port is added one from SRAM memory configurations one second link nodes.Read the broadcast data packet count value in first link nodes of corresponding unicast packet.When the broadcast data packet count value in the link nodes equals zero, represent that this port there is no broadcast data packet and need send, so directly unicast packet is sent out.When the broadcast data packet count value in the link nodes is not equal to zero, after this clean culture type packet has been given in expression again, must be according to the broadcast data packet count value, the packet buffer that is read corresponding this broadcast data packet count value by the SDRAM memory reads broadcast data packet, and broadcast data packet is sent out, send the packet of next link nodes of corresponding present link nodes afterwards again.
Use above-mentioned method can reach the requirement of packet first in first out with the number of times of access memory still less.When a broadcast data packet is sent to, because needn't come the transmission situation of record data bag for pairing output queue of each port and configuration one attribute node by the configuration link node, so can use a large amount of memories.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, cited below particularly preferably buying executed example, and conjunction with figs. elaborates.In the accompanying drawing:
Fig. 1 illustrates the exchange control chip of switch hub core and the annexation figure of memory on every side;
Fig. 2 illustrates the SRAM memory among Fig. 1 and the allocation plan of SDRAM memory;
Fig. 3 A illustrates the structure of existing output queue;
Fig. 3 B illustrates the data format of each link nodes in the existing output queue;
Fig. 3 C illustrates the data format that has the attribute item corresponding with packet buffer now;
Fig. 4 illustrates prior art when transmitting the broadcast-type packet, the structure chart of the output queue of each port;
Fig. 5 illustrates the output queue method according to network packet of the present invention, the allocation plan of the memory that couples with the exchange control chip;
Fig. 6 illustrates the output queue method according to network packet of the present invention, the schematic flow sheet of the formation method of output queue;
Fig. 7 illustrates the schematic flow sheet according to the output queue method of network packet of the present invention;
Fig. 8 illustrates the output queue method according to network packet of the present invention, the data format of each link nodes in the output queue of port;
Fig. 9 illustrates the present invention when transmitting the broadcast-type packet, the structural representation of the output queue of each port; And
Figure 10 illustrates the structural representation according to network data packet switching device of the present invention.
Label declaration:
100 switch type control chip 110SRAM memories
120 SDRAM memories 112 pass on table
114 use the link nodes part 114a that tabulates not use the link nodes of tabulation
116 attribute item parts 116a attribute items
122 packet buffer, 130 output queues
114a ' has used link nodes 114b not use the link nodes of tabulation
140 broadcasting output queues, 10 switch hubs
Each flow process of the formation method of 200～218 output queues
Each flow process of the output queue method of 300～320 network packet
Embodiment
The network exchange formula hub of method of the present invention is controlled by switch type control chip 100 as shown in Figure 1, and this control chip 100 also is couple to first memory 110 and second memory 120, and first memory can be the SRAM memory and second memory can be the SDRAM memory.Please refer to Fig. 5, in SRAM memory 110, mainly also be divide into store pass on matrix section 112 ' with do not use the link nodes part 114 of tabulating ', it comprises the link nodes 114b that several do not use tabulation.Be in do not comprise different with existing SRAM memory configurations is used for the attribute item of record data bag state.The present invention is for not correct of the configuration in the SDRAM memory.The present invention increases a broadcasting output queue (broadcst output queue), the message that the record of its formation is only relevant with broadcast data packet for the processing mode of broadcast-type packet.Each link nodes in the output queue of corresponding each port is then only as record and the relevant message of clean culture type packet.
Please refer to Fig. 6 and cooperate Fig. 5, in order to schematic illustration method of the present invention, it illustrates the output queue method according to network packet of the present invention, the schematic flow sheet of the formation method of output queue, it is applied to have the switch type data packet transmission device of a plurality of ports, and it is as employed switch hub on Ethernet.The following description is the switching hub that has 16 ports (port 0 to port one 5) with.At first carrying out flow process 204, by a wherein port of switch type data packet transmission device, is clean culture type packet or broadcast-type packet for example from port 0 reception one packet, and in the form of flow process 208 judgment data bags.When packet is clean culture type packet, just carry out flow process 212, from SRAM memory 110 configuration one link nodes 114b and output queues, aforesaid output queue corresponds to the port wherein that will send this clean culture type packet, for example one of port one to 15.When packet is a broadcast-type packet, carry out flow process 216,110 another link nodes of configuration 114b give the broadcasting output queue from the SRAM memory, carry out 218 simultaneously, the broadcast data packet count value (broadcast count) in last first link nodes in each output queue of corresponding each port is added one.
Please refer to Fig. 7, it illustrates after a broadcast data packet is sent to by a port, and the method flow formula how to be sent by other ports is intended to.
At first, carry out flow process 304 and read broadcast data packet count value in the link nodes of corresponding unicast packet.When the broadcast data packet count value in the link nodes equals zero, represent that this port there is no broadcast data packet and need send, just carry out flow process 308 and directly unicast packet is sent out.When the broadcast data packet count value in the link nodes is not equal to zero, after this clean culture type packet has been given in expression again, carry out flow process 312, according to the broadcast data packet count value, the packet buffer 122 that is read corresponding this broadcast data packet count value by SDRAM memory 120 reads broadcast data packet, and broadcast data packet is sent out, send the packet of next link nodes of corresponding present link nodes afterwards again.
Fig. 8 illustrates the output queue method according to network packet of the present invention, the example of the data format of each link nodes in the output queue of port.The the 0th to the 15th as a pointer, in order to this point of contact is pointed to next point of contact.The 16th is clean culture type packet or broadcast-type packet in order to indicate its corresponding packet then.The the 17th to the 33rd bit is then as port mask (port mask) or as the broadcast data packet count value.When this node correspondence one clean culture type packet, as the broadcast data packet count value, in order to point out after the pairing clean culture type of this node packet is sent the broadcast data packet number that then will send.When this node correspondence one broadcast-type packet, in order to write down the state that each port has been sent this broadcast data packet or denied.
Then please refer to Fig. 9, it illustrates the present invention when transmitting the broadcast-type packet, the structural representation of the output queue of each port.Mat has this figure, how to guarantee effectively that in order to illustrate in greater detail method of the present invention each port can keep the rule that packet transmits desired first in first out when transmitting broadcast-type packet and clean culture type packet.For purposes of simplicity of explanation, only show the output queue of 3 ports.Illustrative examples is also sending a broadcast data packet to from port 0, and is transferred to other port ones～15.
At time t
2The time, five link nodes of U11～U15 have been gone here and there in the output queue of port one, the output queue of port 2 has then been gone here and there three nodes of U21～U23, and the output queue of port 2 has then been gone here and there seven nodes of U31～U37, and wherein each node is by the link nodes 114b in the SRAM memory 110.The packet buffer of all corresponding clean culture type packet of the link nodes in the output queue of each port one～15, packet buffer is disposed at the block 122 in the SDRAM memory 120.
At the same time, if there are three broadcast data packet to send into switching hub from a port (for example port 0), exchange control chip 100 must be controlled this broadcast data packet and send from port one～15.After a broadcast data packet is sent hub to, control by exchange control chip 100, one link nodes 114b gives the broadcasting output queue from 110 configurations of SRAM memory, and the output queue of this broadcasting output queue and each port is independent fully, only handles the purposes of broadcast data packet.Is example at this embodiment with three broadcast data packet.Just string has three link nodes B1～B3 in the broadcasting output queue.
When each broadcast data packet is put into broadcasting output queue the time, just control chip 100 with last link nodes in the pairing output queue of each port, the value of counting the b field as the broadcasting in U15, U23 and the U37 adds one.At this embodiment, it is worth b=3, after this is illustrated in and sends link nodes U15, U23 and the pairing unicast packet of U37, according to broadcasting count value b=3, read broadcast data packet to pairing packet buffer, and send broadcast data packet from each port successively.
Each port also has a head of broadcast queue (broadcast output queue head), in order to the broadcast data packet of pointing out that first will be sent.H1～H15 as Fig. 9 points to Node B 1.For example after port one is sent first broadcast data packet, just the first H1 of formation is pointed to second Node B 2.Remaining port in like manner can be known by inference.The broadcasting output queue then has shared broadcast queue's tail (broadcastoutput queue tail) T, in order to point out to broadcast last node of output queue.When formation head pointed to node with rear of queue, just expression was sent broadcast data packet fully.At this moment, even there is a unicast packet to send to, for example transfer to port one by port one 2, it becomes clean culture node U16 by SRAM memory 110 configurations one link nodes 114b to output queue.By broadcasting count value b, after port one can be sent the broadcast data packet number of corresponding b value fully, just can be in the unicast packet that continues to send corresponding node U16.
In order to finish the method for above-mentioned packet output, cooperate the switch of the method also to propose explanation in the lump.
Please refer to Figure 10, it illustrates according to a kind of network data packet switching device 10 of the present invention, and it has a plurality of ports (port 0～15), in order to transfer to another port end (for example port one) from a port (for example port 0) wherein after receiving packet.Network data packet switching device 10 comprises exchange control chip 100, first memory 110 at least, as SRAM, second memory 120, as SDRAM, several output queues 130 and a broadcasting output queue 140.Cooperate Fig. 5, SRAM memory 110 to be coupled to exchange control chip 100, and more be distinguished into one pass on list area 112 ' with a link nodes block 114 '.Link nodes block 114 ' then have several link nodes 114b.SDRAM memory 120 also is coupled to exchange control chip 100, and is divided into several packet buffer 122, and by the control that exchanges control chip 100, a packet buffer 122 that is disposed is wherein come the storage data bag.Each several output queue 130 is corresponding one by one with each port (for example port 0～15), and is controlled by exchange control chip 100.For example, when the packet of sending to from port 0 is clean culture type packet, just the link nodes district 114 ' piece configuration link nodes 114b wherein from SRAM memory 110 gives one of output queue 130 as the unicast packet link nodes of clean culture type packet, its correspondence is sent wherein a port, for example port one of this clean culture type packet.Broadcasting output queue 140 is controlled by exchange control chip 100.For example, when the packet of sending to from port 0 is a broadcast-type packet, give broadcasting output queue 140 from link nodes block 114 ' configuration link nodes 114b wherein of SRAM memory 110 as the broadcast data packet link nodes of broadcast-type packet, the numerical value of the broadcast data packet counting field in the last cast link node in each output queue 130 adds one simultaneously.Detailed function mode is narrated as mentioned, does not just state superfluous at this.
Above-mentioned unicast packet link nodes also comprises broadcast queue's owner pointer, in order to point to the node in this broadcasting output queue.The broadcasting output queue also comprises broadcast queue's tail pointer.Wherein this unicast packet link nodes also comprises pointer, in order to point to one of pairing those packet buffer of this unicast packet.Wherein this broadcast data packet link nodes also comprises pointer, in order to point to one of pairing those packet buffer of this broadcast data packet.
Use above-mentioned device just can carry out method of the present invention effectively.Simultaneously, reach the requirement of packet first in first out with the number of times of access memory still less.When a broadcast data packet is sent to, because needn't come the transmission situation of record data bag for pairing output queue of each port and configuration one attribute node by the configuration link node, so can use a large amount of memories.
Therefore, feature of the present invention is that the output queue of corresponding each port is only handled unicast packet, handles broadcast data packet and increase by a broadcasting output queue.
Another feature of the present invention is that the interior node of output queue of each port has the counting field what broadcast data packet whether record will send and send.
The reception that a feature more of the present invention is a broadcast data packet is passed on again, and the number of times of its access memory greatly reduces.
In sum; though the present invention discloses as above in conjunction with the preferred embodiments; yet it is not in order to limit the present invention; those skilled in the art without departing from the spirit and scope of the present invention; can locate out various changes and retouching, so protection scope of the present invention should be defined by accompanying Claim.
Claims (8)
1. the output queue method of the network packet of a switch type data packet transmission device that is applied to have a plurality of ports, the output queue method of this network packet comprises:
Receive a packet, and judge the form of this packet;
When this packet is a clean culture type packet, dispose one first link nodes from a first memory and give an output queue, wherein this output queue corresponds to one of those ports that will send this clean culture type packet;
When this packet is a broadcast-type packet, dispose one second link nodes to a broadcasting output queue from this first memory, simultaneously the broadcast data packet count value in last this first link nodes in each those output queue of each port is added one;
Read this broadcast data packet count value in should this first link nodes of unicast packet;
When this broadcast data packet count value in this link nodes equals zero, directly this unicast packet is sent out; And
When this broadcast data packet count value in this link nodes is not equal to zero, according to this broadcast data packet count value, read by a second memory a packet buffer that should the broadcast data packet count value is read a broadcast data packet, and this broadcast data packet is sent out, send again afterwards next link nodes that should link nodes.
2. the output queue method of network packet as claimed in claim 1, wherein this broadcasting output queue comprises a rear of queue.
3. the output queue method of network packet as claimed in claim 1, wherein this first link nodes comprises broadcast queue's owner pointer, in order to point to the node in this broadcasting output queue.
4. the output queue method of network packet as claimed in claim 1, wherein this broadcasting output queue comprises broadcast queue's tail pointer.
5. the output queue method of network packet as claimed in claim 1, wherein this first link nodes comprises pointer, in order to point to pairing this packet buffer of this unicast packet.
6. the output queue method of network packet as claimed in claim 1, wherein this second link nodes also comprises pointer, in order to point to pairing this packet buffer of this broadcast data packet.
7. the output queue method of network packet as claimed in claim 1, wherein this first memory is a static RAM.
8. the output queue method of network packet as claimed in claim 1, wherein this second memory is a Synchronous Dynamic Random Access Memory.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011167947A CN1165142C (en) | 2001-05-10 | 2001-05-10 | Ouput quene method and device of network data packets |
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| CNB011167947A CN1165142C (en) | 2001-05-10 | 2001-05-10 | Ouput quene method and device of network data packets |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407697C (en) * | 2005-01-30 | 2008-07-30 | 华为技术有限公司 | Organizational scheduling method for multi-mode COS queue and apparatus thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401718C (en) * | 2005-02-04 | 2008-07-09 | 华为技术有限公司 | Data frame group broadcasting duplicating method and system |
| 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 |
| CN104124962B (en) * | 2013-04-25 | 2017-07-07 | 联发科技股份有限公司 | Multistage copy counter storage device and the method for managing the treatment of multicast package |
| US9521007B2 (en) | 2013-04-25 | 2016-12-13 | Mediatek Inc. | Multi-level replication counter storage device for multicast packet processing and related method for managing multicast packet processing |
| CN112039931B (en) * | 2019-06-03 | 2023-04-28 | 本无链科技(深圳)有限公司 | Elastic broadcasting method and system for P2P network |
| US11599649B2 (en) * | 2020-06-29 | 2023-03-07 | Rockwell Automation Technologies, Inc. | Method and apparatus for managing transmission of secure data packets |
| US11606346B2 (en) | 2020-06-29 | 2023-03-14 | Rockwell Automation Technologies, Inc. | Method and apparatus for managing reception of secure data packets |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407697C (en) * | 2005-01-30 | 2008-07-30 | 华为技术有限公司 | Organizational scheduling method for multi-mode COS queue and apparatus thereof |
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