CN102843298B - Realize the method and system of exchanger chip Openflow stream table priority - Google Patents
Realize the method and system of exchanger chip Openflow stream table priority Download PDFInfo
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Abstract
The invention provides a kind of method and system realizing exchanger chip Openflow stream table priority, its method comprises: set up one and store the Hash table of priority value that some Openflow flow, and correspondingly sets up a sequencing table being carried out from big to small by priority values all in Hash table sorting; Each priority value is corresponding with one group of hash, and each group hash comprises somely shows corresponding entry_id value with ACL, and is stored in by described hash in an entry_id chained list; According to the order of the priority value in described sequencing table, all priority values in described Hash table are reordered; According to the Hash table after sequence, obtain the priority order of described entry_id value, and correspondingly sort according to the ACL table of described priority order to switch.The present invention utilizes the acl feature on the chip of conventional switch, realize the stream table priority feature meeting Openflow agreement, and implementation is simple.
Description
Technical field
The present invention relates to ethernet communication technology, particularly relate to a kind of method and system realizing exchanger chip Openflow stream table priority.
Background technology
Current internet development is rapid, the importance of the huge and status of its application scale, far beyond the imagination of designers, and present the Internet mainly contains following drawback: there is no in specific scope that unified management, forwarded mechanism are single with strategy, operator is difficult to optimize to greatest extent own net and conventional switch for the function that forwards and agreement many and assorted, be difficult to configuration, system such as easily to be made mistakes at the problem.For tackling above-mentioned drawback, there has been proposed Openflow switch, the message repeating in conventional switch and forwarding strategy are separated by it, adopt a special controller (controller) to be connected with switch by netting twine.Original like this message repeating function (hardware chip realization) on a switch device and the message repeating strategy (various software protocol) of coexisting just has been separated on different hardware devices.And a controller can also control multiple stage Openflow switch, thus achieve unified forwarding control end, more effectively control network.
In prior art, realize stream table by access control list (ACL) at large, and specify the priority of stream table by the entry_id of ACL.But, conventional switch chip must user specify a value (entry_id) to represent its sequence of positions (i.e. priority) in TCAM, and this value must be unique, and the priority of Openflow can have identical value, namely be not unique, therefore, adopt the entry_id in conventional switch ACL to specify the technology of the priority of stream cannot meet the protocol requirement of Openflow.
Summary of the invention
The object of the present invention is to provide a kind of method realizing exchanger chip Openflow stream table priority.
Corresponding to said method, another goal of the invention of the present invention is also to provide a kind of system realizing exchanger chip Openflow stream table priority.
For achieving the above object, technical scheme of the present invention is: a kind of method realizing exchanger chip Openflow stream table priority, and it comprises:
S1, set up one and store the Hash table of priority value that some Openflow flow, and correspondingly set up a sequencing table being carried out from big to small by priority values all in Hash table sorting;
S2, each priority value is corresponding with one group of hash, each group hash comprises somely shows corresponding entry_id value with ACL, and wherein, described entry_id value is stored in entry_id chained list;
S3, order according to the priority value in described sequencing table, reorder to all priority values in described Hash table;
S4, according to the Hash table after sequence, obtain the priority order of described entry_id value, and show correspondingly to sort to the ACL of switch according to described priority order.
As a further improvement on the present invention, the method S1 step also comprises: a newly-built priority value Priority_new; Judge whether described priority value Priority_new is present in current Hash table, does not if so, operate; If not, in described Hash table and sequencing table, this priority value Priority_new is inserted respectively.
As a further improvement on the present invention, described step S2 also specifically comprises: for described priority value Priority_new correspondence safeguards one or more entry_id value entry_id_new; Described one or more entry_id value entry_id_new is inserted in the hash corresponding to this priority value Priority_new.
As a further improvement on the present invention, in the step of described " inserting described one or more entry_id value entry_id_new in the hash corresponding to this priority value Priority_new ", described entry_id value entry_id_new is inserted in corresponding hash backmost.
As a further improvement on the present invention, described step S4 also specifically comprises: according to priority order from high to low, reads the entry_id value corresponding with each priority value one by one; The priority order of described entry_id value is obtained according to the reading sequencing of entry_id value.
Correspondingly, a kind of system realizing exchanger chip Openflow stream table priority provided by the invention, it comprises:
Unit set up by soft table, stores for setting up one the Hash table of priority value that some Openflow flow, and correspondingly sets up a sequencing table being carried out from big to small by priority values all in Hash table sorting;
Hash corresponding unit, for each priority value is corresponding with one group of hash, each group hash comprises somely shows corresponding entry_id value with ACL, and wherein, described entry_id value is stored in entry_id chained list;
Hash table sequencing unit, for the order according to the priority value in described sequencing table, reorders to all priority values in described Hash table;
ACL list sorting unit, for according to the Hash table after sequence, obtains the priority order of described entry_id value, and correspondingly sorts according to the ACL table of described priority order to switch.
As a further improvement on the present invention, described soft table sets up unit also for a newly-built priority value Priority_new; Judge whether described priority value Priority_new is present in current Hash table, does not if so, operate; If not, in described Hash table and sequencing table, this priority value Priority_new is inserted respectively.
As a further improvement on the present invention, described hash corresponding unit also for: be that described priority value Priority_new correspondence safeguards one or more entry_id value entry_id_new; Described one or more entry_id value entry_id_new is inserted in the hash corresponding to this priority value Priority_new.
As a further improvement on the present invention, in described hash corresponding unit, described entry_id value entry_id_new is inserted in corresponding hash backmost.
As a further improvement on the present invention, described ACL list sorting unit also specifically for: according to priority order from high to low, read the entry_id value corresponding with each priority value one by one; The priority order of described entry_id value is obtained according to the reading sequencing of entry_id value.
The invention has the beneficial effects as follows: technical scheme of the present invention safeguards Hash table and the sequencing table of the relation of Priority and entry_id by setting up, utilize the acl feature on the chip of conventional switch, realize the stream table priority feature meeting Openflow agreement, and implementation is simple.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method realizing exchanger chip Openflow stream table priority in the specific embodiment of the invention;
Fig. 2 is the schematic diagram of unsorted Hash table in the specific embodiment of the invention, sequencing table and corresponding hash;
Fig. 3 is the schematic diagram of ordering Hash table in the specific embodiment of the invention, sequencing table and corresponding hash;
Fig. 4 is the cell schematics of the system realizing exchanger chip Openflow stream table priority in the specific embodiment of the invention.
Embodiment
Describe the present invention below with reference to embodiment shown in the drawings.But these execution modes do not limit the present invention, the structure that those of ordinary skill in the art makes according to these execution modes, method or conversion functionally are all included in protection scope of the present invention.
Shown in ginseng Fig. 1 to Fig. 3, it realizes an embodiment of the method for exchanger chip Openflow stream table priority for the present invention.In the present embodiment, it, by building the priority corresponding relation of entry_id and the Openflow stream of ACL, re-establishes putting in order of the entry_id of conventional switch ACL.As shown in Figure 1, the described method realizing exchanger chip Openflow stream table priority, comprises the steps:
S1, set up one and store the Hash table of priority value that some Openflow flow, and correspondingly set up a sequencing table being carried out from big to small by priority values all in Hash table sorting;
The present invention is the stream table priority utilizing the acl feature on the chip of conventional switch to meet completely Openflow agreement proposes, and first need to set up 2 soft tables to set up the value of entry_id and priority, its concrete data structure is as follows:
First table (Hash table, Hash shows), Hash key assignments is priority (priority), Hash data are a chained list storing entry_id, because Hash realizes principle, the priority value of Hash table is out of order, as shown in Figure 2, in figure, Hash table comprises 4 priority key assignments: 65535,2,3,100, and its sequence is not carried out according to key assignments size.
Second table (sequencing table), the sequencing table of a memory priority level value, difference is: it needs to insert relevant position according to priority value size, to make up the out of order problem of key assignments in Hash table, still shown in ginseng Fig. 2, in figure, sequencing table comprises 4 priority values, and its sequence is: 65535,100,3,2, and is be arranged in order according to order from high to low.
It is worth mentioning that, sequencing table can use " balanced binary tree " or " RBTree " structure, to accelerate sequencing production.
S2, each priority value is corresponding with one group of hash, each group hash comprises somely shows corresponding entry_id value with ACL;
As shown in Figure 2, in the present embodiment, safeguard the entry_id chained list (in figure chained list 1 ~ 11) of multiple storage entry_id value, wherein, entry_id is that in conventional switch chip, user specifies it to represent the sequence of positions of ACL table (TCAM), shown in figure, four priority value 65535,2,3,100 difference corresponding one group of hash separately, and each group hash can comprise one or more entry_id value, such as, priority value 65535 corresponds to first group of hash: chained list node 1, chained list node 2, chained list node 3, chained list node 4; Priority value 2 corresponds to second group of hash: chained list node 5, chained list node 7, chained list node 6; Priority value 3 corresponds to the 3rd group of hash: chained list node 8, chained list node 10; Priority value 100 corresponds to the 4th group of hash: chained list node 9, chained list node 11.Wherein, the entry_id value in each above-mentioned group hash is all sort according to certain order.
In the present invention, because the priority value in above-mentioned Hash table and sequencing table can constantly need search and upgrade, in order to realize the present invention better, the S1 step of said method also comprises:
A newly-built priority value Priority_new; This priority value Priority_new is searched object by as target.
Judge whether described priority value Priority_new is present in current Hash table, does not if so, operate; If not, in described Hash table and sequencing table, this priority value Priority_new is inserted respectively.
Correspondingly, in execution mode more specifically, the step S2 of said method yet comprises the steps:
For described priority value Priority_new correspondence safeguards one or more entry_id value entry_id_new;
Described one or more entry_id value entry_id_new is inserted in the hash corresponding to this priority value Priority_new.
Bright above-mentioned search procedure specifically, it is divided into two kinds of situations:
If 1 priority value newly adding stream does not all have in 2 tables, so in sequencing table, insert priority value according to priority value size, priority value is inserted in the key assignments of Hash table, correspondingly newly-built one or more entry_id chained list is shown in data at Hash, and insert one or more entry_id that user oneself specifies, wherein, the corresponding relation of entry_id and Openflow stream needs user oneself to safeguard.Attention: insert priority value in sequencing table, the order after insertion must be inverted order.As there is priority value: 65535 and 3, so new priority value 100 should be inserted in the middle of 65535 and 3, so just becomes 65535,100,3 these orders.
If 2 priority values newly adding stream have in 2 tables, so priority value need not be inserted in sequence chained list, in the key assignments of Hash table, find the priority value existed, and show to insert one or more new entry_id value in data at corresponding Hash.
It is worth mentioning that, in the step of above-mentioned " inserting described one or more entry_id value entry_id_new in the hash corresponding to this priority value Priority_new ", described entry_id value entry_id_new is inserted in corresponding hash backmost.Like this, after this entry that can only need to sort during TCAM sequence, thus height sequencing production.
S3, order according to the priority value in described sequencing table, reorder to all priority values in described Hash table; Shown in ginseng Fig. 3, it is collated Hash table schematic diagram.
S4, according to the Hash table after sequence, obtain the priority order of described entry_id value, and show correspondingly to sort to the ACL of switch according to described priority order.Wherein, described step S4 also specifically comprises: according to priority order from high to low, reads the entry_id value corresponding with each priority value one by one; The priority order of described entry_id value is obtained according to the reading sequencing of entry_id value.As shown in Figure 3, in the present embodiment, priortiy the highest from the Hash table arranged, obtain the entry_id in Hash data link table successively, then obtain the entry_id of second priority priority, until run through all data.The priority order that finally can obtain entry_id value is: 1,2,3,4,9,11,8,10,5,7,6.After this, again according to the priority order of the entry_id value obtained, we can sort ACL table (TCAM) in traditional ethernet switch again according to a step 5 li new order, just can realize the stream table order of the Openflow being with priority, thus meet the requirement in Openflow agreement.
Next, the system corresponding to said method of the present invention will be introduced.As shown in Figure 4, the described system realizing exchanger chip Openflow stream table priority, comprises as lower unit:
Unit 101 set up by soft table, stores for setting up one the Hash table of priority value that some Openflow flow, and correspondingly sets up a sequencing table being carried out from big to small by priority values all in Hash table sorting;
The present invention is the stream table priority utilizing the acl feature on the chip of conventional switch to meet completely Openflow agreement proposes, and first need to set up 2 soft tables to set up the value of entry_id and priority, its concrete data structure is as follows:
First table (Hash table, Hash shows), Hash key assignments is priority (priority), Hash data are a chained list storing entry_id, because Hash realizes principle, the priority value of Hash table is out of order, as shown in Figure 2, in figure, Hash table comprises 4 priority key assignments: 65535,2,3,100, and its sequence is not carried out according to key assignments size.
Second table (sequencing table), the sequencing table of a memory priority level value, difference is: it needs to insert relevant position according to priority value size, to make up the out of order problem of key assignments in Hash table, still shown in ginseng Fig. 2, in figure, sequencing table comprises 4 priority values, and its sequence is: 65535,100,3,2, and is be arranged in order according to order from high to low.
It is worth mentioning that, sequencing table can use " balanced binary tree " or " RBTree " structure, to accelerate sequencing production.
Hash corresponding unit 102, for each priority value is corresponding with one group of hash, each group hash comprises somely shows corresponding entry_id value with ACL;
As shown in Figure 2, in the present embodiment, safeguard the entry_id chained list (in figure chained list 1 ~ 11) of multiple storage entry_id value, wherein, entry_id is that in conventional switch chip, user specifies it to represent the sequence of positions of ACL table (TCAM), shown in figure, four priority value 65535,2,3,100 difference corresponding one group of hash separately, and each group hash can comprise one or more entry_id value, such as, priority value 65535 corresponds to first group of hash: chained list node 1, chained list node 2, chained list node 3, chained list node 4; Priority value 2 corresponds to second group of hash: chained list node 5, chained list node 7, chained list node 6; Priority value 3 corresponds to the 3rd group of hash: chained list node 8, chained list node 10; Priority value 100 corresponds to the 4th group of hash: chained list node 9, chained list node 11.Wherein, the entry_id value in each above-mentioned group hash is all sort according to certain order.
In the present invention, because the priority value in above-mentioned Hash table and sequencing table can constantly need search and upgrade, in order to realize the present invention better, above-mentioned soft table set up unit 101 also for:
A newly-built priority value Priority_new; This priority value Priority_new is searched object by as target.
Judge whether described priority value Priority_new is present in current Hash table, does not if so, operate; If not, in described Hash table and sequencing table, this priority value Priority_new is inserted respectively.
Correspondingly, in execution mode more specifically, above-mentioned hash corresponding unit 102 yet for:
For described priority value Priority_new correspondence safeguards one or more entry_id value entry_id_new;
Described one or more entry_id value entry_id_new is inserted in the hash corresponding to this priority value Priority_new.
Bright above-mentioned search procedure specifically, it is divided into two kinds of situations:
If 1 priority value newly adding stream does not all have in 2 tables, so in sequencing table, insert priority value according to priority value size, priority value is inserted in the key assignments of Hash table, correspondingly newly-built one or more entry_id chained list is shown in data at Hash, and insert one or more entry_id that user oneself specifies, wherein, the corresponding relation of entry_id and Openflow stream needs user oneself to safeguard.Attention: insert priority value in sequencing table, the order after insertion must be inverted order.As there is priority value: 65535 and 3, so new priority value 100 should be inserted in the middle of 65535 and 3, so just becomes 65535,100,3 these orders.
If 2 priority values newly adding stream have in 2 tables, so priority value need not be inserted in sequence chained list, in the key assignments of Hash table, find the priority value existed, and show to insert one or more new entry_id value in data at corresponding Hash.
It is worth mentioning that, in described hash corresponding unit, described entry_id value entry_id_new is inserted in corresponding hash backmost.Like this, after this entry that can only need to sort during TCAM sequence, thus improve sequencing production.
Hash table sequencing unit 103, for the order according to the priority value in described sequencing table, resequences to all priority values in described Hash table; Shown in ginseng Fig. 3, it is collated Hash table schematic diagram.
ACL list sorting unit 104, for according to the Hash table after sequence, obtains the priority order of described entry_id value, and correspondingly sorts according to the ACL table of described priority order to switch.Wherein, described ACL list sorting unit 104 also specifically for: according to priority order from high to low, read the entry_id value corresponding with each priority value one by one; The priority order of described entry_id value is obtained according to the reading sequencing of entry_id value.As shown in Figure 3, in the present embodiment, priortiy the highest from the Hash table arranged, obtain the entry_id in Hash data link table successively, then obtain the entry_id of second priority priority, until run through all data.The priority order that finally can obtain entry_id value is: 1,2,3,4,9,11,8,10,5,7,6.After this, again according to the priority order of the entry_id value obtained, we can sort ACL table (TCAM) in traditional ethernet switch again according to a step 5 li new order, just can realize the stream table order of the Openflow being with priority, thus meet the requirement in Openflow agreement.
Method and system described in the invention safeguard Hash table and the sequencing table of the relation of Priority and entry_id by setting up, utilize the acl feature on the chip of conventional switch, realize the stream table priority feature meeting Openflow agreement, and the Priority value of stream can be identical, and general Openflow switch acl feature can not realize completely, and technique scheme implementation is simple.
It is worth mentioning that, in the method that the present invention introduces, mentioned step number " S1 ", " S2 " ... sequencing might not be there is between " Sn " etc., hereby state.
Device embodiments described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each execution mode also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
A series of detailed description listed is above only illustrating for feasibility execution mode of the present invention; they are also not used to limit the scope of the invention, all do not depart from the skill of the present invention equivalent implementations done of spirit or change all should be included within protection scope of the present invention.
Claims (10)
1. realize a method for exchanger chip Openflow stream table priority, it is characterized in that, described method comprises:
S1, set up one and store the Hash table of priority value that some Openflow flow, and correspondingly set up a sequencing table being carried out from big to small by priority values all in Hash table sorting;
S2, each priority value is corresponding with one group of hash, each group hash comprises somely shows corresponding entry_id value with ACL, and wherein, described entry_id value is stored in entry_id chained list;
S3, order according to the priority value in described sequencing table, reorder to all priority values in described Hash table;
S4, according to the Hash table after sequence, obtain the priority order of described entry_id value, and show correspondingly to sort to the ACL of switch according to described priority order.
2. method according to claim 1, is characterized in that, the method S1 step also comprises:
A newly-built priority value Priority_new;
Judge whether described priority value Priority_new is present in current Hash table, does not if so, operate; If not, in described Hash table and sequencing table, this priority value Priority_new is inserted respectively.
3. method according to claim 2, is characterized in that, described step S2 also specifically comprises:
For described priority value Priority_new correspondence safeguards one or more entry_id value entry_id_new;
Described one or more entry_id value entry_id_new is inserted in the hash corresponding to this priority value Priority_new.
4. method according to claim 3, it is characterized in that, in the step of described " inserting described one or more entry_id value entry_id_new in the hash corresponding to this priority value Priority_new ", described entry_id value entry_id_new is inserted in corresponding hash backmost.
5. method according to claim 1, is characterized in that, described step S4 also specifically comprises:
According to priority order from high to low, read the entry_id value corresponding with each priority value one by one; The priority order of described entry_id value is obtained according to the reading sequencing of entry_id value.
6. realize a system for exchanger chip Openflow stream table priority, it is characterized in that, described system comprises:
Unit set up by soft table, stores for setting up one the Hash table of priority value that some Openflow flow, and correspondingly sets up a sequencing table being carried out from big to small by priority values all in Hash table sorting;
Hash corresponding unit, for each priority value is corresponding with one group of hash, each group hash comprises somely shows corresponding entry_id value with ACL, and wherein, described entry_id value is stored in entry_id chained list;
Hash table sequencing unit, for the order according to the priority value in described sequencing table, reorders to all priority values in described Hash table;
ACL list sorting unit, for according to the Hash table after sequence, obtains the priority order of described entry_id value, and correspondingly sorts according to the ACL table of described priority order to switch.
7. system according to claim 6, is characterized in that, described soft table set up unit also for:
A newly-built priority value Priority_new;
Judge whether described priority value Priority_new is present in current Hash table, does not if so, operate; If not, in described Hash table and sequencing table, this priority value Priority_new is inserted respectively.
8. system according to claim 7, is characterized in that, described hash corresponding unit also for:
For described priority value Priority_new correspondence safeguards one or more entry_id value entry_id_new;
Described one or more entry_id value entry_id_new is inserted in the hash corresponding to this priority value Priority_new.
9. system according to claim 8, is characterized in that, in described hash corresponding unit, described entry_id value entry_id_new is inserted in corresponding hash backmost.
10. system according to claim 6, is characterized in that, described ACL list sorting unit also specifically for: according to priority order from high to low, read the entry_id value corresponding with each priority value one by one; The priority order of described entry_id value is obtained according to the reading sequencing of entry_id value.
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| CN104735000A (en) * | 2013-12-23 | 2015-06-24 | 中兴通讯股份有限公司 | OpenFlow signaling control method and device |
| CN103731354B (en) * | 2013-12-25 | 2018-01-26 | 江苏省未来网络创新研究院 | One kind is based on self-defined multilevel flow table fast matching method |
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| CN105812277B (en) * | 2014-12-31 | 2019-04-12 | 中国电信股份有限公司 | The control method and system of access request, communication equipment |
| CN106034046A (en) * | 2015-03-20 | 2016-10-19 | 中兴通讯股份有限公司 | Method and device for sending access control list (ACL) |
| CN104965686B (en) * | 2015-07-20 | 2019-01-22 | 北京金山安全软件有限公司 | Priority queue design method and priority queue design device |
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