CN105743678A - Method and apparatus for managing table space of ternary content addressable memory (TCAM) - Google Patents
Method and apparatus for managing table space of ternary content addressable memory (TCAM) Download PDFInfo
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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Abstract
The invention provides a method and apparatus for managing table space of a ternary content addressable memory (TCAM). The method comprises the following steps: configuring first parameters of a first register of the TCAM, wherein the first parameters comprise a table look-up space scope, and the table look-up space scope is corresponding to multiple blocks; according to the table look-up space scope, configuring second parameters of a second register of the TCAM, wherein the second parameters comprise the space size and the table look-up width of each block in the table look-up space scope; performing table writing in the first block and the second block which are adjacent, wherein the table writing direction of the first block is opposite to that of the second block; and determining whether the first block and the second block are fully written, if the first block is fully written yet the second block is not fully written, adjusting the first parameters and the second parameters, and performing the table writing according to the adjusted first parameters and the adjusted second parameters. The method provided by the invention can enable the TCAM to realize capacity sharing of hardware blocks.
Description
Technical field
The present invention relates to communication technical field, particularly to a kind of method managing three-state content addressing memory TCAM table space and device.
Background technology
Along with the development of network, the growth of network traffics and the appearance of new business, it is necessary to the network equipment has linear speed and disposal ability flexibly.Current network chip includes special IC (ASIC, ApplicationSpecificIntegratedCircuits) and the big class of network processing unit (NP) two.Network processing unit is by its high speed processing and programmability flexibly, it has also become the effective solution that in current network, data process.
Network processing unit has multiple different memorizer, such as SRAM (SRAM), three-state content addressing memory (TCAM, ternarycontentaddressablememory), synchronous DRAM (SDRAM, SynchronousDynamicRandomAccessMemory) etc., miscellaneous service list item deposited by these memorizeies, such as port table, hardware address (MAC, MediaAccessControl) table, routing table etc..
TCAM is mainly used in quickly searching list items such as accessing control list (ACL, AccessControlList), route.TCAM is mainly characterized by fast parallel lookup, and usually, microcode extracts relevant information one key assignments of composition from message to the application on network processing unit, sends look-up command by the TCAM controller of NP to TCAM, according to result treatment message.
The feature of TCAM is that cost is high, power consumption is big, finite capacity；Advantage is quick lookup, fixed delay, supports longest prefix match and multizone coupling.In order to make full use of the TCAM space of preciousness, TCAM is generally adopted the multilist differentiation technology on hardware, and a TCAM is divided into the block of some sizes, and the key assignments that microcode sends is parallel search in multiple pieces (block) simultaneously, can once send key assignments, return multiple checking result.
In order to support the lookup of different in width, each block will configure the width W that tables look-up.The NL11K series of such as NETLOGIC, typical width has 80,160,320,640；The TCAM of Integrated Device Technology, Inc., representative width has 72,144,288,576.
With internet protocol version four (IPv4)/IPv 6 (IPv6) ACL citing, IPv4 five-tuple width is 107bit；The width of IPv6ACL Match IP v6 five-tuple is 299bit.By NL11K series, the corresponding data base of IPv4 to configure by 160bit bit wide, and type of database is made into classification and matching；The corresponding block of IPv6ACL to configure according to 320bit bit wide.Owing to width is different, both business list items must be put in different hardware block.
The width of tabling look-up that current common practice is each block fixes, and the low space high to address writes successively from address to write table in each block.Typical case's application, IPv4acl and IPv6acl distributes in two adjacent hardware block, and allocation space is all 64K*80bit, and table look-up width respectively 160bit and 320bit, and the capacity of such IPv4acl is 32K, IPv6acl capacity is 16K.This method drawback is to accomplish that capacity is shared.
Summary of the invention
The purpose of the embodiment of the present invention is in that to provide a kind of method managing three-state content addressing memory TCAM table space and device, TCAM can be made to realize hardware block capacity and share.
In order to achieve the above object, The embodiment provides a kind of method managing three-state content addressing memory TCAM table space, the method includes:
First parameter of first depositor of configuration TCAM, the first parameter includes spatial dimension of tabling look-up, the corresponding multiple pieces of block of spatial dimension of tabling look-up；
According to spatial dimension of tabling look-up, the second parameter of second depositor of configuration TCAM, the second parameter includes at the space size of each block tabled look-up in spatial dimension and width of tabling look-up；
Adjacent block and the two block writes table, and a block write apparent bearing and the 2nd block to write apparent bearing contrary；
Judge whether block and the two block writes full, if a block writes full and the 2nd block is not full, then adjust the first parameter and the second parameter, to be incorporated into by the segment space adjacent for block with the oneth in the 2nd block to a block, and write table according to the first parameter after adjusting and the second parameter.
Wherein, method also includes:
If block and the two block is not full, then continue to write table；
If block and the two block writes full, then return the information that writeback table is failed.
Wherein, adjacent block and the two block writes table, and the apparent bearing reverse step of writing writing apparent bearing and the 2nd block of a block includes:
In block and the two block, table is write respectively according to from the high direction low to address in the low direction high to address, address and address.
Wherein, it is judged that it is full whether block and the two block writes, if a block writes full and the 2nd block is not full, then adjust the first parameter and the second parameter, and before write the step of table according to the first parameter after adjusting and the second parameter, method also include:
Detect in the 2nd block and whether there is fragment；
If there is fragment, then fragment is compressed.
Wherein, what write in a block is IPv4 access control list ACL, and the width of tabling look-up of a block is 160bit.
Wherein, that write in the 2nd block is IPv6ACL, and the width of tabling look-up of the 2nd block is 320bit.
Embodiments of the invention additionally provide a kind of device managing three-state content addressing memory TCAM table space, and this device includes:
First configuration module, for configuring the first parameter of first depositor of TCAM, the first parameter includes spatial dimension of tabling look-up, the corresponding multiple pieces of block of spatial dimension of tabling look-up；
Second configuration module, for according to tabling look-up spatial dimension, the second parameter of second depositor of configuration TCAM, the second parameter includes at the space size of each block tabled look-up in spatial dimension and width of tabling look-up；
Write table module, for writing table in adjacent block and the two block, and a block write apparent bearing and the 2nd block to write apparent bearing contrary；
Judge module, is used for judging whether block and the two block writes full, and when a block writes completely and the 2nd block is not full, triggers adjusting module,
Adjusting module, for the triggering according to judge module, adjusts the first parameter and the second parameter, and to be incorporated into by the segment space adjacent for block with the oneth in the 2nd block to a block, and triggering is write table module and write table according to the first parameter after adjusting and the second parameter.
Wherein, device also includes:
Judge module is when block and the two block is not full, and triggering is write table module and continued to write table, and when block and the two block writes full, triggers and return module；
Return module, for the triggering according to judge module, return the information that writeback table is failed.
Wherein, write table module to include:
First module, for writing table according to from the high direction low to address in the low direction high to address, address and address respectively in block and the two block.
Wherein, device also includes:
Detection module, is used for detecting in the 2nd block whether there is fragment, and when there is fragment, triggers compression module；
Compression module, for being compressed fragment.
Wherein, what write in a block is IPv4 access control list ACL, and the width of tabling look-up of a block is 160bit.
Wherein, that write in the 2nd block is IPv6ACL, and the width of tabling look-up of the 2nd block is 320bit.
The such scheme of the present invention at least includes following beneficial effect:
In the method for the management three-state content addressing memory TCAM table space of the embodiment of the present invention, the business of width of two kinds of differences being tabled look-up is put in adjacent block and the two block respectively, and the oneth block and the two block to write apparent bearing contrary, when so writing the table in full and the 2nd block when the table in a block for writing full, can pass through to configure the first depositor and the parameter of the second depositor, the segment space adjacent for block with the oneth in 2nd block is incorporated into a block, so that TCAM realizes hardware block capacity and shares.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the method managing three-state content addressing memory TCAM table space in the embodiment of the present invention；
Fig. 2 is the space schematic diagram of block and the two block before the space size of dynamically adjustment the oneth block and the two block in the embodiment of the present invention；
Fig. 3 is the space schematic diagram of block and the two block after the space size of dynamically adjustment the oneth block and the two block in the embodiment of the present invention；
Fig. 4 is the structural representation of the device managing three-state content addressing memory TCAM table space in the embodiment of the present invention.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The embodiment of the present invention for TCAM hardware block in prior art can not capacity share problem, it is provided that a kind of method managing three-state content addressing memory TCAM table space and device, can make TCAM realize hardware block capacity share.
As it is shown in figure 1, The embodiment provides a kind of method managing three-state content addressing memory TCAM table space, the method includes:
Step 11, the first parameter of first depositor of configuration TCAM, the first parameter includes spatial dimension of tabling look-up, the corresponding multiple pieces of block of spatial dimension of tabling look-up.
In a particular embodiment of the present invention, the first parameter of the first depositor is used to show, the spatial dimension of tabling look-up when tabling look-up with TCAM, and the corresponding multiple hardware block of this scope of tabling look-up.
Step 12, according to spatial dimension of tabling look-up, the second parameter of second depositor of configuration TCAM, the second parameter includes at the space size of each block tabled look-up in spatial dimension and width of tabling look-up.
In a particular embodiment of the present invention, the table put in each hardware block of TCAM table look-up width and space size likely all different.Such as, in existing network, IPv6ACL is actual will not be configured a lot, and the comparison that IPv4ACL can configure is many, thus be accordingly used in the space of the hardware block putting IPv6ACL can space than the hardware block for putting IPv4ACL little.Simultaneously, owing to the width of IPv4 five-tuple is 107bit, the width of IPv6 five-tuple is 299bit, therefore, width of tabling look-up for putting the hardware block of IPv4ACL can be different with the width of tabling look-up for putting the hardware block of IPv6ACL, and concrete width of tabling look-up can configure according to the model of TCAM, for instance NL11K series, the corresponding data base of IPv4 to configure by 160bit bit wide, and the corresponding block of IPv6ACL to configure according to 320bit bit wide.
Step 13, adjacent block and the two block writes table, and the oneth block write apparent bearing and the 2nd block to write apparent bearing contrary, specifically, in block and the two block, write table according to from the high direction low to address in the low direction high to address, address and address respectively.
In a particular embodiment of the present invention, oneth block entry is low from address to be write to address height, 2nd block entry is write from address height is low to address, so when a block is fully written and the 2nd block not written full time, can pass through to adjust the first parameter and the second parameter, redistribute the space size of block and the two block.It addition, in an embodiment of the present invention, it is possible to configure adjacent two block as required and write table by above-mentioned table method of writing, it is achieved capacity is shared, and still can traditionally write table mode for other block in TCAM and carry out writing table.
Step 14, judge whether block and the two block writes full, if a block writes full and the 2nd block is not full, then adjust the first parameter and the second parameter, to be incorporated into by the segment space adjacent for block with the oneth in the 2nd block to a block, and write table according to the first parameter after adjusting and the second parameter.
In the above embodiment of the present invention, said method also includes: judges whether block and the two block writes full, if block and the two block is not full, then continues to write table；If block and the two block writes full, then return the information that writeback table is failed.
In the above embodiment of the present invention, perform in step 14 to judge whether block and the two block writes full, if a block writes full and the 2nd block is not full, then adjust the first parameter and the second parameter, and write the step of table according to the first parameter after adjusting and the second parameter before, said method also includes: whether detection the 2nd block exists fragment；If there is fragment, then fragment being compressed, so making software management simple, being not related to a large amount of list item and move, forwarding face unaffected.
In a particular embodiment of the present invention, it is possible to the reserved capacity of configuration the oneth block and the two block, for instance it is reserved that block and the two block is respectively arranged with the space of 1/3, and this part headspace exclusively enjoys for oneself.The business that so can be unlikely in a block takes two block spaces, and can use without point space when user to configure the business of the 2nd block later.
In a particular embodiment of the present invention, illustrate for ACL table, also ACL deletion action can be carried out once in a while due to user, make the hardware block of TCAM would be likely to occur free space, certain likely each deletion action is all with squeeze operation, being also possible to not compress, wait until that appropriate time is compressed, this typically relies on TCAM table management algorithm.Wherein, the effect of compression is in that to be concentrated into the scattered fragment in the 2nd block continuous print space, and the continuous space after concentrating is moved to the position adjacent for block with the oneth, it is simple to a block takies these fragment spaces.
Alternatively, in the above embodiment of the present invention, what write in a block is IPv4 access control list ACL, and the width of tabling look-up of a block is 160bit；That write in the 2nd block is IPv6ACL, and the width of tabling look-up of the 2nd block is 320bit.
In a particular embodiment of the present invention, illustrate for a concrete example, after configuring the first parameter of the first depositor and the second parameter of the second depositor, a block writes IPv4ACL by the low direction high to address, address, 2nd block writes IPv6ACL by the direction that address height to address is low, as shown in Figure 2, wherein, before dynamically adjusting the space size of block and the two block, the space of the oneth block is M, the space of the 2nd block is N, when detecting that a block writes completely and the 2nd block is not full, can dynamically adjust the space size of block and the two block.Namely, adjust the first parameter and the second parameter, space P adjacent for block with the oneth in 2nd block is incorporated into a block, and the width of tabling look-up of space P also changes into the same with the width of tabling look-up of space M, so, as it is shown on figure 3, the space enlargement of a block is M+N, the reduced space of the 2nd block is N-P.Wherein, the first depositor and the second depositor need the concrete model according to TCAM to determine.If what such as adopt in this example is the words of the TCAM of netlogicNL series, second depositor includes logical table depositor (LTR, LogicalTableRegister) the block mask register (BSR in group, BlockSelectRegister), and block configuration register (BCR, BlockConfigurationRegister) etc..
In order to realize above-mentioned purpose better, as shown in Figure 4, embodiments of the invention additionally provide a kind of device managing three-state content addressing memory TCAM table space, and this device includes:
First configuration module 41, for configuring the first parameter of first depositor of TCAM, the first parameter includes spatial dimension of tabling look-up, the corresponding multiple pieces of block of spatial dimension of tabling look-up；
Second configuration module 42, for according to tabling look-up spatial dimension, the second parameter of second depositor of configuration TCAM, the second parameter includes at the space size of each block tabled look-up in spatial dimension and width of tabling look-up；
Write table module 43, for writing table in adjacent block and the two block, and a block write apparent bearing and the 2nd block to write apparent bearing contrary；
Judge module 44, is used for judging whether block and the two block writes full,
And when a block writes completely and the 2nd block is not full, trigger adjusting module 45,
Adjusting module 45, for the triggering according to judge module 44, adjusting the first parameter and the second parameter, to be incorporated into by the segment space adjacent for block with the oneth in the 2nd block to a block, and triggering is write table module 43 and is write table according to the first parameter after adjusting and the second parameter.
Wherein, device also includes:
Judge module 44 is when block and the two block is not full, and triggering is write table module 43 and continued to write table, and when block and the two block writes full, triggers and return module；
Return module, for the triggering according to judge module, return the information that writeback table is failed.
Wherein, write table module 43 to include:
First module, for writing table according to from the high direction low to address in the low direction high to address, address and address respectively in block and the two block.
Wherein, device also includes:
Detection module, is used for detecting in the 2nd block whether there is fragment, and when there is fragment, triggers compression module,
Compression module, for being compressed fragment.
Wherein, what write in a block is IPv4 access control list ACL, and the width of tabling look-up of a block is 160bit.
Wherein, that write in the 2nd block is IPv6ACL, and the width of tabling look-up of the 2nd block is 320bit.
The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from principle of the present invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (12)
1. the method managing three-state content addressing memory TCAM table space, it is characterised in that including:
Configuring the first parameter of first depositor of described TCAM, described first parameter includes spatial dimension of tabling look-up, described in table look-up the corresponding multiple pieces of block of spatial dimension；
According to described spatial dimension of tabling look-up, configuring the second parameter of second depositor of described TCAM, described second parameter includes at the space size of described each block tabled look-up in spatial dimension and tables look-up width；
Adjacent block and the two block writes table, and a described block write apparent bearing and described 2nd block to write apparent bearing contrary；
Judge whether a described block and described 2nd block writes full, if it is not full that a described block writes full and described 2nd block, then adjust described first parameter and the second parameter, will described 2nd block incorporate into a described block with described adjacent for a block segment space, and write table according to the first parameter after adjusting and the second parameter.
2. the method for claim 1, it is characterised in that described method also includes:
If a described block and described 2nd block is not full, then continue to write table；
If a described block and described 2nd block writes full, then return the information that writeback table is failed.
3. the method for claim 1, it is characterised in that described table of writing in adjacent block and the two block, and the apparent bearing reverse step of writing writing apparent bearing and described 2nd block of a described block includes:
In a described block and described 2nd block, table is write respectively according to from the high direction low to address in the low direction high to address, address and address.
4. the method for claim 1, it is characterized in that, it is described that to judge whether a described block and described 2nd block writes full, if it is not full that a described block writes full and described 2nd block, then adjust described first parameter and the second parameter, and write the step of table according to the first parameter after adjusting and the second parameter before, described method also includes:
Detect in described 2nd block and whether there is fragment；
If there is fragment, then described fragment is compressed.
5. the method for claim 1, it is characterised in that what write in a described block is IPv4 access control list ACL, and the width of tabling look-up of a described block is 160bit.
6. the method for claim 1, it is characterised in that write in described 2nd block is IPv6ACL, and the width of tabling look-up of described 2nd block is 320bit.
7. the device managing three-state content addressing memory TCAM table space, it is characterised in that including:
First configuration module, for configuring first parameter of the first depositor of described TCAM, described first parameter includes spatial dimension of tabling look-up, described in table look-up the corresponding multiple pieces of block of spatial dimension；
Second configuration module, for according to described in table look-up spatial dimension, configure the second parameter of second depositor of described TCAM, described second parameter includes at the space size of described each block tabled look-up in spatial dimension and width of tabling look-up；
Write table module, for writing table in adjacent block and the two block, and a described block write apparent bearing and described 2nd block to write apparent bearing contrary；
Judge module, is used for judging whether a described block and described 2nd block writes full, and when a described block writes completely and described 2nd block is not full, triggers adjusting module,
Adjusting module, for the triggering according to described judge module, adjust described first parameter and the second parameter, will described 2nd block incorporate into a described block with described adjacent for a block segment space, and write table module described in triggering and write table according to the first parameter after adjusting and the second parameter.
8. device as claimed in claim 7, it is characterised in that described device also includes:
Described judge module, when a described block and described 2nd block is not full, is write table module and is continued to write table described in triggering, and when a described block and described 2nd block writes full, triggers and return module；
Return module, for the triggering according to described judge module, return the information that writeback table is failed.
9. device as claimed in claim 7, it is characterised in that described in write table module and include:
First module, for writing table according to from the high direction low to address in the low direction high to address, address and address respectively in a described block and described 2nd block.
10. device as claimed in claim 7, it is characterised in that described device also includes:
Detection module, is used for detecting in described 2nd block whether there is fragment, and when there is fragment, triggers compression module；
Compression module, for being compressed described fragment.
11. device as claimed in claim 7, it is characterised in that what write in a described block is IPv4 access control list ACL, and the width of tabling look-up of a described block is 160bit.
12. device as claimed in claim 7, it is characterised in that write in described 2nd block is IPv6ACL, and the width of tabling look-up of described 2nd block is 320bit.
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| CN201410764043.7A CN105743678A (en) | 2014-12-11 | 2014-12-11 | Method and apparatus for managing table space of ternary content addressable memory (TCAM) |
| PCT/CN2015/079107 WO2016090848A1 (en) | 2014-12-11 | 2015-05-15 | Method and device for managing table space of ternary content addressable memory |
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| CN108279853A (en) * | 2018-01-19 | 2018-07-13 | 盛科网络（苏州）有限公司 | IPMC date storage methods based on TCAM |
| CN108512776A (en) * | 2018-03-07 | 2018-09-07 | 深圳市风云实业有限公司 | The flexible combination method, apparatus and chip of TCAM tables in exchange chip |
| CN108769045A (en) * | 2018-06-07 | 2018-11-06 | 深圳市风云实业有限公司 | Acl rule configuration method, device and the network equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113992579B (en) * | 2021-09-23 | 2023-03-31 | 新华三信息安全技术有限公司 | Routing table entry storage method, routing table entry searching method and routing table entry searching device |
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| US7028098B2 (en) * | 2001-07-20 | 2006-04-11 | Nokia, Inc. | Selective routing of data flows using a TCAM |
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| CN104009922B (en) * | 2014-05-09 | 2017-03-15 | 烽火通信科技股份有限公司 | IPV4/IPV6 routing capacity sharing methods based on TCAM |
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| CN101039252A (en) * | 2006-03-15 | 2007-09-19 | 中兴通讯股份有限公司 | Method for managing route table of ternary content addressable memory |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108279853A (en) * | 2018-01-19 | 2018-07-13 | 盛科网络（苏州）有限公司 | IPMC date storage methods based on TCAM |
| CN108512776A (en) * | 2018-03-07 | 2018-09-07 | 深圳市风云实业有限公司 | The flexible combination method, apparatus and chip of TCAM tables in exchange chip |
| CN108769045A (en) * | 2018-06-07 | 2018-11-06 | 深圳市风云实业有限公司 | Acl rule configuration method, device and the network equipment |
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