CN109905495A - A kind of method and device reducing cpu load - Google Patents
A kind of method and device reducing cpu load Download PDFInfo
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- CN109905495A CN109905495A CN201910132702.8A CN201910132702A CN109905495A CN 109905495 A CN109905495 A CN 109905495A CN 201910132702 A CN201910132702 A CN 201910132702A CN 109905495 A CN109905495 A CN 109905495A
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Abstract
Present invention discloses a kind of method and devices for reducing cpu load to store forwarding information into FDB table while method includes that the forwarding information of unicast message is reported CPU by forwarding chip, and it is invalid for identifying the forwarding information；When forwarding chip, which receives a large amount of identical unicast messages, to be entered from same port, further search for the presence or absence of forwarding information corresponding to unicast message in FDB table, and in the presence of forwarding information is no longer sent to CPU.The logical forwarding information using pre- study mechanism removal redundancy of the present invention, being capable of effective offloading the CPU.
Description
Technical field
The present invention relates to network communication technology fields, more particularly, to a kind of method and device for reducing cpu load.
Background technique
Existing MAC Address software learning method generally includes following steps: forwarding chip receives unicast message, and records
Source MAC and ingress port information in unicast message；Forwarding chip is searched in FDB table with the presence or absence of the source MAC of unicast message
Source MAC and ingress port information are sent to by location if the source MAC of unicast message is not present in forwarding tables of data
Source MAC address information is written in the FDB table of all forwarding chips after receiving source MAC address information by CPU, CPU.
Since the processing speed of CPU is relatively slow for forwarding chip, if inbound port receives largely together in the short time
The message (source MAC is identical) of sample, at this time since source MAC address information is not written in FDB table also by CPU, and a large amount of phases
Same source MAC address information is sent to CPU, causes cpu load excessively high.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of method and device for reducing cpu load is provided.
To achieve the above object, the following technical solutions are proposed by the present invention: a method of reducing cpu load, including forwarding
The learning method and retransmission method of chip, wherein
Learning method includes: that forwarding chip receives unicast message, obtains the source MAC of unicast message；Forwarding chip is looked into
Look in FDB table the source MAC that whether there is unicast message, and in the absence of the corresponding forwarding information of unicast message stored
Into FDB table, and forwarding information is set as in vain, forwarding information to be further sent to CPU；After CPU receives forwarding information
Forwarding information is set as effective；
Retransmission method includes: that forwarding chip receives unicast message and obtains the target MAC (Media Access Control) address of unicast message；Forwarding chip
The target MAC (Media Access Control) address that whether there is unicast message in forwarding tables of data is searched, and in presence and the corresponding forwarding letter of unicast message
Breath E-Packets when being effective.
Preferably, indicate whether forwarding information is invalid by setting invalidated identification position, when the value of invalidated identification position is first
When preset value, the corresponding forwarding information of unicast message is invalid；When the value of invalidated identification position is the second preset value, unicast message
Corresponding forwarding information is effective.
Preferably, in retransmission method, if the target MAC (Media Access Control) address of unicast message is not present in FDB table, by unicast message
It is sent to all of the port.
Preferably, in retransmission method, if there are the target MAC (Media Access Control) address of unicast message in FDB table, and unicast message is corresponding
Forwarding information be it is invalid, then unicast message is sent to all of the port.
Preferably, the forwarding chip includes asic chip or fpga chip or NP chip.
Present invention further teaches a kind of device for reducing cpu load, including forwarding chip and CPU, the forwarding chip packets
Study module and forwarding module are included, the study module is used to receive unicast message and obtains the source MAC of unicast message, into
One step searches the source MAC that whether there is unicast message in FDB table, and in the absence of by unicast message corresponding forwarding letter
Breath is stored into FDB table, and forwarding information is set as in vain, forwarding information to be further sent to CPU；The CPU is used for
It receives and sets effective for forwarding information after forwarding information；The forwarding module is for receiving unicast message and obtaining unicast report
The target MAC (Media Access Control) address of text further searches for the target MAC (Media Access Control) address that whether there is unicast message in FDB table, and in presence and the list
Casting text corresponding forwarding information E-Packets when being effective.
Preferably, the study module includes
First message processing module (MPM) for receiving unicast message, and obtains the source MAC of unicast message；
First searching module, for searching in FDB table with the presence or absence of source MAC；
Forwarding information processing module, for when the first searching module does not find source MAC that unicast message is corresponding
Forwarding information store into FDB table, and forwarding information is set as in vain, forwarding information to be further sent to CPU.
Preferably, the forwarding module includes
Second message processing module (MPM) for receiving unicast message, and obtains the target MAC (Media Access Control) address of unicast message；
Second searching module, for searching in FDB table with the presence or absence of target MAC (Media Access Control) address；
Third message processing module (MPM), for finding target MAC (Media Access Control) address in the second searching module and unicast message is corresponding
Forwarding information E-Packets when being effective.
Preferably, the forwarding module further includes
4th message processing module (MPM), for finding target MAC (Media Access Control) address in the second searching module and unicast message is corresponding
Forwarding information be it is invalid when, by unicast message be sent to all of the port or
When the second searching module does not find target MAC (Media Access Control) address, unicast message is sent to all of the port.
Preferably, the forwarding chip includes asic chip or fpga chip or NP chip.
The beneficial effects of the present invention are:
A kind of method and device of disclosed reduction cpu load, forwarding chip believe the forwarding of unicast message
While breath reports CPU, forwarding information is stored into FDB table, and it is invalid for identifying the forwarding information；When forwarding chip receives
When entering to a large amount of identical unicast messages from same port, further search in FDB table with the presence or absence of corresponding to unicast message
Forwarding information, and in the presence of forwarding information is no longer sent to CPU, lead to using pre- study mechanism removal redundancy forwarding letter
Breath, being capable of effective offloading the CPU.
Detailed description of the invention
Fig. 1 is the learning method flow chart schematic diagram of forwarding chip of the invention；
Fig. 2 is the retransmission method flow chart schematic diagram of forwarding chip of the invention；
Fig. 3 is the learning process schematic diagram of forwarding chip of the invention；
Fig. 4 is the forwarding process schematic diagram of forwarding chip of the invention；
Fig. 5 is the device of the invention structural block diagram schematic diagram.
Specific embodiment
Below in conjunction with attached drawing of the invention, clear, complete description is carried out to the technical solution of the embodiment of the present invention.
A kind of method of disclosed reduction cpu load removes the forwarding information of redundancy using pre- study mechanism,
While the forwarding information of unicast message is reported CPU by offloading the CPU, i.e. forwarding chip, forwarding information is stored to FDB
In table, and it is invalid for identifying the forwarding information；Enter when forwarding chip receives a large amount of identical unicast messages from same port
When, further search for the presence or absence of forwarding information corresponding to unicast message in FDB table, and in the presence of no longer by forwarding information
It is sent to CPU, and then mitigates CPU burden.
In conjunction with shown in FIG. 1 to FIG. 4, the method for disclosed a kind of reduction cpu load comprising forwarding chip
Learning method and retransmission method, wherein in conjunction with shown in Fig. 1 and Fig. 3, the learning method of forwarding chip includes the following steps:
Step S101, forwarding chip receive unicast message and obtain the source MAC of unicast message；
Step S102, forwarding chip are searched the source MAC that whether there is the unicast message in FDB table, are being not present
When the corresponding forwarding information of unicast message is stored into FDB table, and set forwarding information in vain, further will forwarding letter
Breath is sent in CPU；
Step S103, CPU are received and are set effective for forwarding information after forwarding information.
Specifically, forwarding chip parses unicast message after receiving unicast message, obtains source MAC, simultaneously also
It can get ingress port information associated with source MAC, forwarding chip further to the source MAC of unicast message and enters end
Message breath is recorded.In the present embodiment, ASIC (Application Specific Integrated is may be selected in forwarding chip
Circuit, specific integrated circuit) chip or FPGA (Field-Programmable Gate Array, field-programmable gate array
Column) chip or NP (Network Processor, network processing unit) chip.
FDB table (FDB, Forwarding DataBase) is used for the forwarding information of stored messages, such as source MAC, purpose
The associated ingress port information of MAC Address, source MAC and the associated exit port information of target MAC (Media Access Control) address etc..When unicast message
After source MAC and ingress port information are recorded, forwarding chip further searches for the source that whether there is unicast message in FDB table
MAC Address when implementation, can search whether the source MAC there are unicast message by way of traversing FDB table.
When the source MAC of the unicast message is not present in FDB table, further the corresponding forwarding of the unicast message is believed
Breath is stored into FDB table, wherein forwarding information includes source MAC, target MAC (Media Access Control) address, the associated inbound port of source MAC
Information and the associated exit port information of target MAC (Media Access Control) address, while setting invalid for the corresponding forwarding information of the unicast message.
Whether invalid in the present embodiment, forwarding information can be indicated by setting invalidated identification position.When implementation, it can turn to be each
Photos and sending messages configure an invalidated identification position, when the value of invalidated identification position is the first preset value, indicate corresponding turn of the unicast message
Photos and sending messages are invalid；When the value of invalidated identification position is the second preset value, indicate that the corresponding forwarding information of the unicast message is to have
Effect.In the present embodiment, the first preset value is 1, and the second preset value is 0, it is of course also possible to which it is 0 that the first preset value, which is arranged, second is pre-
If value is 1.
After setting invalid for the corresponding forwarding information of unicast message, forwarding information is further sent to CPU, CPU
After receiving forwarding information, set effective for forwarding information.When implementation, CPU is by setting for the value of invalidated identification position
Two preset values be arranged in turn the forwarding information be effective namely CPU receive it is forwarding information is corresponding invalid after forwarding information
Marker zero setting processing, keeps the forwarding information effective.
In conjunction with shown in Fig. 2 and Fig. 4, the retransmission method of forwarding chip includes the following steps:
Step S201, forwarding chip receive unicast message and obtain the target MAC (Media Access Control) address of unicast message；
Step S202, forwarding chip search the target MAC (Media Access Control) address that whether there is unicast message in FDB table, if purpose MAC
Location there are in FDB table, and the corresponding forwarding information of the unicast message be it is effective, then E-Packet.
Specifically, after forwarding chip, which receives a large amount of identical unicast messages, to be entered from same port, further to list
Casting text is parsed, and the target MAC (Media Access Control) address of the unicast message is obtained, and is further searched in FDB table with the presence or absence of purpose MAC
Address.When implementation, it can search whether that there are target MAC (Media Access Control) address by way of traversing FDB table.
When, there are when target MAC (Media Access Control) address, forwarding chip is not necessarily to forwarding information being sent to CPU, and then alleviates in FDB table
CPU burden.Further, judge whether the corresponding forwarding information of the unicast message is effective, if effectively, further according to forwarding
Exit port information in information forwards unicast message.If in FDB table, there are target MAC (Media Access Control) address, but corresponding turn of the unicast message
Photos and sending messages be it is invalid, then flood unicast message to all of the port.When implementation, if the value of invalidated identification position is the second preset value,
I.e. the value of invalidated identification position is 0, then the forwarding information is effective.
When target MAC (Media Access Control) address is not present in FDB table, then unicast message is flooded to all of the port.
As shown in figure 5, present invention further teaches a kind of device for reducing cpu load, including forwarding chip and CPU, wherein
Forwarding chip includes study module and forwarding module；
Study module is used to receive unicast message and obtains the source MAC of unicast message, further search for be in FDB table
It is no that there are the source MACs of unicast message, and in the absence of the corresponding forwarding information of unicast message stored into FDB table,
And it sets forwarding information in vain, forwarding information to be further sent to CPU；
CPU is for setting effective for forwarding information after receiving forwarding information；
Forwarding module is used to receive unicast message and obtains the target MAC (Media Access Control) address of unicast message, further searches in FDB table
With the presence or absence of the target MAC (Media Access Control) address of unicast message, and when existing and the corresponding forwarding information of the unicast message is effective, forwarding
Message.
Specifically, study module includes the first message processing module (MPM), the first searching module and forwarding information processing module,
In, the first message processing module (MPM) obtains the source MAC of unicast message for receiving unicast message, when implementation, the first message
Processing module parses available source MAC by carrying out to unicast message, it is, of course, also possible to obtain related to source MAC
The ingress port information etc. of connection；First searching module is for searching in FDB table with the presence or absence of source MAC, and when implementation, first is searched
The mode that traversal FDB table can be used in module is searched；Forwarding information processing module in the first searching module for not finding
The corresponding forwarding information of unicast message is stored into FDB table when source MAC, and sets forwarding information in vain, into one
Forwarding information is sent to CPU by step, wherein forwarding information includes that source MAC, target MAC (Media Access Control) address, source MAC are associated
Ingress port information and the associated exit port information of target MAC (Media Access Control) address.
In the present embodiment, whether forwarding information processing module is invalid by setting invalidated identification position mark forwarding information.It is real
Shi Shi can configure an invalidated identification position for each forwarding information, when the value of invalidated identification position is the first preset value, indicate the list
The corresponding forwarding information of casting text is invalid；When the value of invalidated identification position is the second preset value, indicate that the unicast message is corresponding
Forwarding information be effective.In the present embodiment, the first preset value is 1, and the second preset value is 0, it is of course also possible to which it is pre- to be arranged first
If value is 0, the second preset value is 1.
After CPU receives forwarding information, set effective for forwarding information.When implementation, CPU is by by invalidated identification position
Value be set as the second preset value be arranged the forwarding information be effective namely CPU receive it is forwarding information is corresponding after forwarding information
Invalidated identification position zero processing, keep the forwarding information effective.
As shown in figure 5, forwarding module includes the second message processing module (MPM), the second searching module and third Message processing mould
Block, wherein the second message processing module (MPM) obtains the target MAC (Media Access Control) address of unicast message for receiving unicast message, when implementation,
Second message processing module (MPM) parses available target MAC (Media Access Control) address by carrying out to unicast message, it is, of course, also possible to obtain and source
Associated exit port information of MAC Address etc.；Second searching module is for searching in FDB table with the presence or absence of target MAC (Media Access Control) address；The
Three message processing module (MPM)s are for there are turn when target MAC (Media Access Control) address and effective corresponding forwarding information of the unicast message in FDB table
It transmits messages text, when implementation, unicast message can be forwarded according to the exit port information in forwarding information.
Further, forwarding module further includes the 4th message processing module (MPM) (not shown), is used in FDB table be not present
When target MAC (Media Access Control) address and the corresponding forwarding information of the unicast message are invalid, then unicast message is flooded to all of the port or in FDB
Unicast message is flooded when target MAC (Media Access Control) address being not present in table to all of the port.When implementation, if the value of invalidated identification position is second pre-
If value namely the value of invalidated identification position are 0, then the forwarding information is effective.
Technology contents and technical characteristic of the invention have revealed that as above, however those skilled in the art still may base
Make various replacements and modification without departing substantially from spirit of that invention, therefore, the scope of the present invention in teachings of the present invention and announcement
It should be not limited to the revealed content of embodiment, and should include various without departing substantially from replacement and modification of the invention, and be this patent Shen
Please claim covered.
Claims (10)
1. a kind of method for reducing cpu load, which is characterized in that learning method and retransmission method including forwarding chip, wherein
Learning method includes: that forwarding chip receives unicast message, obtains the source MAC of unicast message；Forwarding chip searches FDB
Whether there is the source MAC of unicast message in table, and in the absence of the corresponding forwarding information of unicast message stored to FDB
In table, and forwarding information is set as in vain, forwarding information to be further sent to CPU；CPU will forwarding after receiving forwarding information
Information is set as effective；
Retransmission method includes: that forwarding chip receives unicast message and obtains the target MAC (Media Access Control) address of unicast message；Forwarding chip is searched
The target MAC (Media Access Control) address that whether there is unicast message in tables of data is forwarded, and in presence and the corresponding forwarding information of unicast message is
It E-Packets when effectively.
2. the method according to claim 1, wherein by setting invalidated identification position indicate forwarding information whether without
Effect, when the value of invalidated identification position is the first preset value, the corresponding forwarding information of unicast message is invalid；When invalidated identification position
When value is the second preset value, the corresponding forwarding information of unicast message is effective.
3. the method according to claim 1, wherein in retransmission method, if unicast message is not present in FDB table
Target MAC (Media Access Control) address, then unicast message is sent to all of the port.
4. the method according to claim 1, wherein in retransmission method, if there are unicast messages in FDB table
Target MAC (Media Access Control) address, and the corresponding forwarding information of unicast message be it is invalid, then unicast message is sent to all of the port.
5. the method according to claim 1, wherein the forwarding chip include asic chip or fpga chip or
NP chip.
6. a kind of device for reducing cpu load, which is characterized in that including forwarding chip and CPU, the forwarding chip includes study
Module and forwarding module, the study module are used to receive unicast message and obtain the source MAC of unicast message, further look into
Look in FDB table the source MAC that whether there is unicast message, and in the absence of the corresponding forwarding information of unicast message stored
Into FDB table, and forwarding information is set as in vain, forwarding information to be further sent to CPU；The CPU is for receiving
Set effective for forwarding information after forwarding information；The forwarding module is used to receive unicast message and obtains the mesh of unicast message
MAC Address, further search in FDB table whether there is unicast message target MAC (Media Access Control) address, and exist and the unicast message
Corresponding forwarding information E-Packets when being effective.
7. device according to claim 6, which is characterized in that the study module includes
First message processing module (MPM) for receiving unicast message, and obtains the source MAC of unicast message；
First searching module, for searching in FDB table with the presence or absence of source MAC；
Forwarding information processing module, for when the first searching module does not find source MAC by corresponding turn of unicast message
Photos and sending messages are stored into FDB table, and forwarding information is set as in vain, forwarding information to be further sent to CPU.
8. device according to claim 6, which is characterized in that the forwarding module includes
Second message processing module (MPM) for receiving unicast message, and obtains the target MAC (Media Access Control) address of unicast message；
Second searching module, for searching in FDB table with the presence or absence of target MAC (Media Access Control) address；
Third message processing module (MPM), for finding target MAC (Media Access Control) address and the corresponding forwarding of unicast message in the second searching module
Information E-Packets when being effective.
9. device according to claim 8, which is characterized in that the forwarding module further includes
4th message processing module (MPM), for finding target MAC (Media Access Control) address and the corresponding forwarding of unicast message in the second searching module
Information be it is invalid when, by unicast message be sent to all of the port or
When the second searching module does not find target MAC (Media Access Control) address, unicast message is sent to all of the port.
10. device according to claim 6, which is characterized in that the forwarding chip includes asic chip or fpga chip
Or NP chip.
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| CN201910132702.8A CN109905495A (en) | 2019-02-22 | 2019-02-22 | A kind of method and device reducing cpu load |
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Application publication date: 20190618 |