WO2014169874A1

WO2014169874A1 - Table entry management device, table entry management method, and computer storage medium

Info

Publication number: WO2014169874A1
Application number: PCT/CN2014/077802
Authority: WO
Inventors: 包闯; 赖明亮
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-08-12
Filing date: 2014-05-19
Publication date: 2014-10-23
Also published as: CN104378295B; CN104378295A

Abstract

The present invention embodiment discloses a table entry management device, a table entry management method, and a computer storage medium, said device including: a structure definition table (SDT) unit, configured for maintaining a table entry length and a table entry base address corresponding to a first search, and also a table entry length and a table entry base address corresponding to a second search; a search scheduling unit, configured for initiating the first search in regard to a level-2 search management unit, and, in accordance with an offset amount returned by the level-2 search management unit, initiating a second search in regard to a cache management unit; a return scheduling unit, configured for sending table item contents, which are returned by the cache management unit following the second search, to a corresponding search interface.

Description

Item management device, table item management method, and computer storage medium

The present invention relates to communication technologies, and in particular, to an entry management device, an entry management method, and a computer storage medium. Background technique

Network Processor (NP) is an Application Specific Instruction Processor (ASIP) designed for network applications. ASIP has its own structural features and special circuit design for network packet processing. It is also a software programmable chip that enables network systems to deliver high performance and flexibility.

When the network processor is used in different scenarios, the types of table lookups, the capacity of table entries, and the performance of table lookups are quite different. The traditional method of table entry management cannot adapt to changing application scenarios. Summary of the invention

The embodiment of the present invention provides an entry management device and an entry management method, so as to solve at least the problem that the related entry search technology cannot meet the requirements for the entry type, the entry size, and the lookup performance of the entry in the multiple scenarios.

The technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides an entry management device, where the device includes: a structure definition table (SDT), a lookup scheduling unit, a second level search management unit, a cache management unit, and a return scheduling unit.

The SDT unit is configured to maintain a table entry length and an entry base address corresponding to the first lookup of the entry, and a table entry length and an entry base address corresponding to the second lookup of the entry; a scheduling unit, configured to be initiated according to the discovery interface in the SDT unit Searching for the corresponding entry length and the entry base address of the entry, and the key value corresponding to the first search sent by the lookup interface when the first lookup is initiated, and initiating the first search to the secondary search management unit And initiating a second search to the cache management unit according to the offset returned by the secondary lookup management unit and the entry length and the entry base address of the SDT unit corresponding to the second lookup;

The return scheduling unit is configured to send the content of the second searched item returned by the cache management unit to the corresponding search interface.

Preferably, the SDT unit is further configured to maintain information of a search algorithm used for the first search;

The locating and scheduling unit is further configured to determine, according to the information of the search algorithm corresponding to the first search initiated by the search interface in the SDT unit, a secondary search management unit of the search algorithm corresponding to the response, and determine The secondary lookup management unit initiates a first lookup to the cache management unit.

Preferably, the apparatus further includes a secondary lookup unit corresponding to the secondary lookup management unit;

The secondary search management unit is further configured to: according to the first entry search initiated by the lookup interface in the SDT unit, the entry length and the entry base address, and the key value corresponding to the first lookup , initiating a first search to the corresponding secondary search unit;

The secondary search unit is further configured to: according to the first item search initiated by the lookup interface, the entry length and the entry base address, and the first searched key value. The corresponding offset information is requested from the cache management unit.

Preferably, the SDT unit is further configured to maintain information corresponding to a target memory type of the first search;

The secondary search unit is further configured to request, according to the type information of the target memory corresponding to the first lookup initiated by the lookup interface in the SDT unit, to the corresponding cache management unit. Offset information;

The cache management unit is further configured to request the offset information of the secondary search unit to search for offset information in the corresponding memory.

Preferably, the SDT unit is further configured to maintain information corresponding to a target memory type of the second search;

The search scheduling unit is further configured to request the content of the entry from the corresponding cache management unit according to the type information of the target memory corresponding to the second search in the SDT unit.

Preferably, the SDT unit is further configured to maintain an enable identifier for the second lookup; the lookup scheduling unit is further configured to determine, when receiving the offset returned by the second level search management unit, When the enable identifier of the second search corresponding to the first lookup initiated by the lookup interface is valid, the second search is initiated to the cache management unit, otherwise, the received offset information is sent to the first start. Find the lookup interface that requests the offset information.

Preferably, the SDT unit is further configured to directly search for a corresponding entry length and a base address of the entry;

The lookup scheduling unit is further configured to: according to the table entry length and the table base address corresponding to the direct search initiated by the lookup interface in the SDT unit, and the key value sent when the lookup interface initiates a direct lookup, Initiating a direct lookup to the cache management unit;

The return scheduling unit is configured to send the content of the directly searched item returned by the cache management unit to a lookup interface that initiates the direct search to request the content of the corresponding entry.

Preferably, the SDT unit is further configured to maintain information corresponding to the target memory type directly searched and directly search for used algorithm information;

The search scheduling unit is further configured to request the content of the entry from the corresponding cache management unit according to the type information of the target memory corresponding to the direct search in the SDT unit and the algorithm information used for directly searching.

Preferably, the return scheduling unit is further configured to query the content of the same entry according to the first Finding or directly searching for a corresponding pointer, determining a sequence of the first search or the direct search initiation, and sending the content of the entry returned by the cache management unit to the first one according to the determined sequence Secondary lookup or lookup interface for the direct lookup.

Preferably, the device further includes:

An entry management unit, configured to send, by the cache management unit, the direct search, the content of the entry corresponding to the second search, and the offset information corresponding to the first search to a corresponding type of memory .

The embodiment of the present invention further provides an entry management method, which is applied to an entry management device, where the device includes: an SDT unit, a lookup scheduling unit, a secondary search management unit, a cache management unit, and a return scheduling unit; Includes:

The SDT unit maintains the entry length and the entry base address corresponding to the first lookup of the entry, and the entry length and the entry base address corresponding to the second lookup of the entry;

The lookup scheduling unit is configured to: according to the first item searched by the search interface, the entry length and the entry base address, and the search interface to initiate the first search, and the key value corresponding to the first search, Initiating a first lookup to the secondary lookup management unit, and returning an offset according to the first lookup returned by the second level lookup management unit, and an entry corresponding to the second lookup in the SDT unit a length and an entry base address, and initiating a second search to the cache management unit;

The return scheduling unit sends the content of the second searched item returned by the cache management unit to the corresponding search interface.

Preferably, the method further includes:

The SDT unit maintains information for the first lookup using the lookup algorithm;

The search scheduling unit determines, according to the information of the search algorithm corresponding to the first search initiated by the lookup interface in the SDT unit, the secondary search management unit of the search algorithm corresponding to the response, and uses the determined secondary search a management unit, initiating the cache management unit for the first time Find.

Preferably, the device further includes a secondary search unit corresponding to the secondary search management unit; and correspondingly, the method further includes:

And the second-level search management unit, according to the first item search and the base address corresponding to the first search initiated by the search interface, and the key value corresponding to the first search, to the corresponding The secondary search unit initiates a first lookup;

The secondary searching unit sends the cache entry length and the entry base address corresponding to the first lookup initiated by the lookup interface in the SDT unit, and the key value corresponding to the first lookup to the cache. The snap-in requests the corresponding offset information.

Preferably, the method further includes:

The SDT unit maintains information corresponding to the target memory type of the first lookup; the secondary search unit according to the type information of the target memory corresponding to the first lookup initiated by the lookup interface in the SDT unit, to the corresponding The cache management unit requests the offset information; the cache management unit searches for the offset information in the corresponding memory according to the request of the offset information of the secondary search unit.

Preferably, the method further includes:

The SDT unit maintains information corresponding to the target memory type of the second search; the search scheduling unit requests the corresponding cache management unit according to the type information of the target memory corresponding to the second search in the SDT unit. The contents of the entry.

Preferably, the method further includes:

The SDT unit maintains an enable identifier for the second search;

When the receiving the scheduling unit receives the offset returned by the second-level search management unit, determining whether the enable identifier of the second search corresponding to the first search sent by the search interface is Valid, if valid, initiate a second lookup to the cache management unit, otherwise; send the received offset information to initiate the first lookup to request the bias The search interface for the shift information.

Preferably, the method further includes:

The SDT unit maintains a direct search for the corresponding entry length and the base address of the entry;

The search scheduling unit initiates a direct search according to the length of the entry and the base address of the entry directly initiated by the lookup interface in the SDT unit, and the key value sent by the lookup interface when the direct search is initiated;

The return scheduling unit sends the content of the entry returned by the direct search returned by the cache management unit to a lookup interface that initiates the direct search to request the content of the corresponding entry.

Preferably, the method further includes:

The SDT unit maintains information corresponding to the target memory type directly searched and directly searches for the used algorithm information;

The search scheduling unit requests the content of the entry from the corresponding cache management unit according to the type information of the target memory corresponding to the direct search in the SDT unit and the algorithm information used for directly searching.

Preferably, the method further includes:

Determining, by the return scheduling unit, the first search or the direct search initiation sequence according to the first search of the content of the same entry, or directly searching for the corresponding pointer, according to the determined sequence, The contents of the entry returned by the cache management unit are sent to a lookup interface that initiates the first lookup or the direct lookup.

Preferably, the device further includes: an entry management unit; and the method further includes: the entry management unit, by the cache management unit, the table corresponding to the direct search and the second search The item content, the offset information corresponding to the first search is sent to a corresponding type of memory.

An embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, where the computer executable instructions are used to execute the foregoing items. Management method.

According to the technical solution provided by the embodiment of the present invention, the information corresponding to the direct search, the first search, and the second search, such as the lookup entry type, the lookup entry length, and the lookup table entry base address, are implemented. Flexible configuration of item storage;

Supports secondary lookup (first lookup and second lookup), without returning the first lookup entry content (offset information) to the lookup interface on the user side, based only on the first lookup interface and preset The second lookup enablement flag can initiate a second search, which saves the overhead of the instruction and improves the search efficiency;

According to the search for the corresponding pointer, the content of the corresponding entry can be returned in the order in which the search is initiated, so that the order can be implemented;

Indirect addressing is used to find the contents of the table. It overcomes the shortcomings of the bus address space caused by the random access memory (RAM) in the traditional technology, and can be widely applied to other address spaces. In the item management scenario. DRAWINGS

1 is a schematic structural diagram of a component management apparatus according to an embodiment of the present invention;

2a is a schematic structural diagram of the SDT unit 101 storing the first search and the second search corresponding entry information according to an embodiment of the present invention;

2b is a schematic diagram of a structure in which the SDT unit 101 stores a direct search for corresponding entry information according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a lookup scheduling unit 102 according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a cache management unit 104 according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a control register according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of an entry management unit 107 according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart of implementing an entry management method according to an embodiment of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

1 is a schematic structural diagram of a table item management apparatus according to an embodiment of the present invention. As shown in FIG. 1, the method includes: an SDT unit 101, a lookup scheduling unit 102, a secondary lookup management unit 103, a cache management unit 104, and a return scheduling unit 105. ; among them,

The SDT unit 101 is configured to maintain an entry length and an entry base address corresponding to the first lookup of the entry, and an entry length and an entry base address corresponding to the second lookup of the entry;

The lookup scheduling unit 102 is configured to: according to the table entry length and the entry base address corresponding to the first lookup initiated by the lookup interface in the SDT unit 101, and the correspondence sent by the lookup interface when the first lookup is initiated. The first searched key value initiates a first search to the secondary search management unit 103, and according to the offset returned by the secondary search management unit 103, and the SDT unit 101 and the first Finding the corresponding entry length and the entry base address twice, and initiating a second search to the cache management unit 104;

The return scheduling unit 105 is configured to send the content of the second searched item returned by the cache management unit 104 to the corresponding search interface.

In an actual application, the SDT unit 101 maintains different indexes for different entries. When the lookup interface initiates the first lookup, according to the SDT table index sent by the lookup interface, the length of the corresponding entry is determined. The base address of the entry and the base entry length and the base address of the entry corresponding to the second lookup of the entry.

Preferably, the SDT unit 101 is further configured to maintain search algorithm information used for the first search;

The locating and scheduling unit 102 is further configured to determine, according to the information of the search algorithm corresponding to the first search initiated by the search interface in the SDT unit 101, the secondary search management unit 103 that responds to the corresponding search algorithm, and Through the determined secondary search management unit 103, The cache management unit 104 initiates a first lookup.

Preferably, the apparatus further includes a secondary lookup unit 106 corresponding to the secondary lookup management unit 103;

The secondary search management unit 103 is further configured to: the entry length and the entry base address corresponding to the first lookup initiated by the lookup interface in the SDT unit 101, and the corresponding first lookup Key value, initiates a first search to the corresponding secondary search unit 106;

The second-level searching unit 106 is further configured to: according to the first item search and the base address corresponding to the first search initiated by the search interface in the SDT unit 101, and corresponding to the first search The key value is requested from the cache management unit 104 for the corresponding offset information.

The offset information is used for subsequent second lookups

Preferably, the SDT unit 101 is further configured to maintain information corresponding to a target memory type of the first lookup;

The secondary searching unit 106 is further configured to request an offset from the corresponding type of the cache management unit 104 according to the type information of the target memory corresponding to the first lookup initiated by the lookup interface in the SDT unit 101. Information

The cache management unit 104 is further configured to look up the offset information in the corresponding memory according to the request of the offset information of the secondary search unit.

In a practical application, the type of the memory may include an on-chip memory and an off-chip memory. Accordingly, when the secondary search unit 106 is in the target memory type information of the first lookup maintained by the SDT unit 101, determining the first lookup. When the type of the corresponding target memory is on-chip memory, the offset management information is requested from the cache management unit 104 responsible for the first lookup of the on-chip memory.

Preferably, the SDT unit 101 is further configured to maintain information corresponding to a target memory type of the second search;

The lookup scheduling unit 102 is further configured to be in accordance with the SDT unit 101 and the first The type information of the corresponding target memory is searched twice, and the content of the entry is requested from the corresponding cache management unit 104.

Preferably, the SDT unit 101 is further configured to maintain an enable identifier for the second lookup; the lookup scheduling unit 102 is further configured to, when receiving the offset returned by the second level search management unit 103, Determining whether the enable identifier corresponding to the second search corresponding to the first search initiated by the search interface is valid, and if valid, initiating a second search to the cache management unit 104; otherwise, receiving the received The offset information is sent to a lookup interface that initiates a first lookup to request the offset information.

The SDT unit 101 is further configured to directly search for a corresponding entry length and an entry base address;

The lookup scheduling unit 102 is further configured to: according to the table entry length and the entry base address corresponding to the direct lookup initiated by the lookup interface in the SDT unit 101, and the key value sent when the lookup interface initiates a direct lookup, Initiating a direct lookup to the cache management unit 104;

The return scheduling unit 105 is configured to send the content of the directly searched entry returned by the cache management unit 104 to the lookup interface α that initiates the first lookup to request the offset information.

Preferably, the SDT unit 101 is further configured to maintain information corresponding to a target memory type directly searched and directly search for used algorithm information;

The lookup scheduling unit 102 is further configured to request the content of the entry from the corresponding cache management unit 104 according to the type information of the target memory corresponding to the direct search in the SDT unit 101 and the algorithm information used for directly searching.

Preferably, the return scheduling unit 105 is further configured to determine, according to the first lookup of the content of the same entry or directly search for the corresponding pointer, determine the sequence of the first search or the direct search initiation, according to the The determined order sends the contents of the entry returned by the cache management unit to the lookup interface that initiates the first lookup or the direct lookup. In an actual application, the return scheduling unit 105 sends the content of the entry returned by the cache management unit 104 to the corresponding search interface according to the search interface identifier corresponding to the first search and the direct search. .

Preferably, the device further comprises:

The entry management unit 107 is configured to deliver, by the cache management unit 104, the entry corresponding to the direct search, the first search, and the second search to a corresponding type of memory.

In practical applications, each unit in the entry management device can be implemented by a Network Processor (NP).

2a is a schematic structural diagram of the SDT unit 101 storing the first lookup and the second lookup corresponding entry information according to the embodiment of the present invention. As shown in FIG. 2a, the method includes:

1) The first time to find the entry type;

The first finding the corresponding search algorithm information and the type information of the target memory for the first search; wherein

The search algorithm includes: a hash search algorithm, a route lookup algorithm, and a high-speed route lookup algorithm based on a Ternary Content Addressable Memory (TCAM); the above search algorithms are secondary search algorithms, that is, For the content of the entry to be searched, the offset information of the entry is determined by the first search, and the second search is performed according to the offset information determined by the first search to determine the content of the entry to be searched.

The types of target memory include on-chip memory and off-chip memory.

2) The first lookup table entry base address;

The first lookup table entry base address is a stored start address of an entry corresponding to the same entry type. In the embodiment of the present invention, the content of the first searched entry of the same search algorithm is in the corresponding slice. The contiguous space is stored in the memory or off-chip memory, and the starting address of the contiguous space is the base address of the first lookup entry type. 3) The length of the first lookup entry;

That is, the length of each entry for the first lookup of the same lookup algorithm.

4) The second lookup entry enable identifier;

When the first identification of the corresponding entry is completed, the offset information of the first search and the second searched entry corresponding to the first search are preset. Type, table item base address, and table item length for a second lookup.

5) The second lookup entry type;

Includes type information for the target memory for the second lookup.

6) The second lookup table entry base address;

The base address of the entry is the stored start address of the entry corresponding to the same entry type. In the embodiment of the present invention, the content of the second searched entry of the same search algorithm is in the corresponding on-chip memory or off-chip. The memory utilizes contiguous spatial storage, the starting address of which is the base address of the second lookup entry type.

7) The second lookup entry length.

That is, the length of each entry corresponding to the second lookup of the same lookup algorithm.

For example, when the lookup interface initiates the first lookup, it is assumed that the first lookup uses the hash lookup algorithm, and the storage space of the offset information to be searched is determined by storing the key value of the first lookup sent according to the lookup table interface. For: (first lookup table entry base address + key value) ~ (first lookup table entry base address + key value + first lookup table entry length); correspondingly, the second lookup of the table entry content The storage space is: (second lookup table entry base address + offset) ~ (first lookup table entry base address + offset + second lookup table entry length).

FIG. 2b is a schematic structural diagram of the SDT unit 101 storing a direct search for the corresponding entry information according to the embodiment of the present invention. As shown in FIG. 2b, the method includes:

1) directly look up the entry type;

Including directly looking up the corresponding search algorithm information and the type of target memory directly searched Information; among them,

The direct search corresponding algorithm refers to a search algorithm that can query the content of the corresponding entry by one search, that is, for the entry to be searched, directly according to the key value of the entry to be searched and the base address of the entry to be searched. The length of the entry, which determines the content of the entry to be searched.

The type of the target memory includes an on-chip memory and an off-chip memory. In an actual application, in a scenario where the length of the entry is relatively small but the search performance is relatively high, an on-chip search mode may be adopted, that is, in the scenario, The delivered entries are stored in the on-chip memory and searched in the corresponding on-chip memory. In the scenario where the length of the entry is relatively large or the performance of the table is high, the on-chip memory and the off-chip memory can be mixed and stored. The way the item is published, and the corresponding on-chip memory or off-chip memory is searched.

2) directly look up the base address of the entry;

The direct lookup table entry base address is a stored start address of an entry corresponding to the same entry type. In the embodiment of the present invention, the content of the first searched entry of the same search algorithm is in the corresponding on-chip memory or The off-chip memory utilizes contiguous spatial storage, the starting address of which is the base address of the first lookup entry type.

3) directly look up the length of the entry;

That is, the length of each entry corresponding to the direct lookup of the same lookup algorithm.

For example, when the lookup interface initiates a direct lookup, the storage space of the entry to be searched is determined according to the key value sent by the lookup table interface: (table entry base address + key value) ~ (table entry base address + key value + direct lookup table Item length).

In an actual application, when the entry management device in the embodiment of the present invention is applied to a scenario in which the number of maintenance entries is large and the search frequency is high, in order to avoid searching for congestion, and ensuring the response rate to the search, the lookup scheduling unit 102 The type of target memory for one lookup, second lookup, and direct lookup, and the lookup algorithm used, caches the first lookup, the second lookup, and the direct lookup for the corresponding key and the corresponding information in the SDT table. Corresponding queue, according to preset The load balancing policy, scheduling the first information of the cache, the second search, and the direct search, corresponding to initiating the first search, the second search, or the direct search, and initiating the first search, the first The corresponding search interface identifier is sent when the second search or direct search.

The following is a description of the direct search, the first search, and the second search. FIG. 3 is a schematic structural diagram of the search and scheduling unit 102 according to an embodiment of the present invention. As shown in FIG. 3, the second search and analysis sub-unit 301 is included. a first lookup parsing subunit 302, a direct lookup cache subunit 303, a first lookup cache subunit 304, a second lookup cache subunit 305, a first lookup management subunit 306, and a second lookup management subunit 307; among them,

The first lookup parsing sub-unit 302 is configured to directly search for a key value, and a direct lookup table entry base address and a direct lookup table entry length corresponding to the direct lookup in the SDT unit 101, according to a target memory directly searched. Type, cached to the corresponding direct lookup cache subunit 303; the first searched key value, and the first lookup table entry base address and first lookup corresponding to the first lookup in the SDT unit 101 The length of the entry, according to the type of the target memory of the first lookup, is cached to the corresponding first lookup cache subunit 304;

The second lookup parsing subunit 301 is configured to set a second lookup key value, and a second lookup table entry base address and a second lookup table corresponding to the second lookup in the SDT unit 101. The length of the item, according to the type of the target memory of the second search, is cached to the corresponding second lookup cache subunit 305;

The second lookup scheduling sub-unit 307 is configured to schedule a key value cached by the first lookup cache subunit 304 connected to the first lookup scheduling subunit 307, a first lookup table entry base address, and a first The secondary lookup table entry length, initiates a first lookup to the secondary lookup management unit 103 connected to the second lookup scheduling subunit 307, and sends a first lookup corresponding search interface identifier to the secondary lookup unit 106. And pointers;

The first lookup management sub-unit 306 is configured to schedule a key value cached by the second lookup cache subunit 305 connected to the first lookup and dispatch subunit 306, and a second lookup table entry base address. And the second lookup entry length, initiates a first lookup to the cache management unit 104 connected to the first lookup management subunit 306, and sends the first lookup corresponding search interface identifier and pointer to the cache management unit 104. And configuring, by the direct lookup cache subunit 303 connected to the first lookup and dispatching subunit 306, a key value, a direct lookup table base address, and a direct lookup entry length, to the first lookup management subunit. The cache management unit 104 of the connection 306 initiates a direct lookup and sends a direct lookup to the corresponding lookup interface identifier and pointer to the cache management unit 104.

For example, when the lookup interface initiates a direct lookup, the first lookup parsing sub-unit 302 selects the direct lookup entry base address and the direct lookup entry length corresponding to the direct lookup initiated by the lookup interface in the SDT unit 101, and directly searches for The type of the target memory is cached in the corresponding direct lookup cache subunit 303. When the lookup interface initiates the first lookup, the first lookup parsing subunit 302 will first search the SDT unit 101 and the lookup interface. The corresponding first lookup table entry base address and the first lookup entry length, and the type of the target memory that is first searched, are cached in the corresponding first lookup cache subunit 304;

The first search parsing sub-unit 302 respectively corresponds to the search algorithm used by the first search (including the hash search algorithm and the route search algorithm); the second search management sub-unit 307 according to the preset load balancing policy, from the corresponding The first lookup cache sub-unit 304 schedules the first lookup of the corresponding first lookup table base address and the first lookup entry length for the first time, and initiates the first lookup to the corresponding secondary lookup management unit 103.

In the actual application, when the cache management unit 104 needs to respond to the first lookup initiated by the direct lookup and secondary lookup scheduling unit 106 initiated by the lookup scheduling unit 102 (ie, perform a read operation), and the table sent by the receiving entry management unit 107. In order to avoid the conflict between the read and write operations, the cache management unit 104 may further divide the storage address of the physical storage of the memory into a plurality of address segments, and buffer the read and write operations of each address segment according to the pre-processing. The load balancing policy is executed to perform read and write operations on the memory in sequence, and to verify the results of the read and write operations. FIG. 4 is a schematic structural diagram of a cache management unit 104 according to an embodiment of the present invention. As shown in FIG. 4, the method includes:

The address resolution subunit 401 is configured to parse an access address of a memory storing the item to be published, and determine a physical address of the memory corresponding to the access address;

The cache management scheduling sub-unit 402 is configured to parse the physical address, and send the to-be-published item to the corresponding cache management control sub-unit 403;

The cache management control sub-unit 403 is configured to cache the to-be-published item to the read-write queue according to the physical address corresponding to the item to be published; cache the first-time searched physical address to the read-write queue; Cache the directly searched physical address to the read/write queue; perform the operations in the read/write queue in sequence according to the preset load balancing policy, including: the content of the entry to be delivered in the read/write queue Write the memory 404 corresponding to the cache management control sub-unit 403, obtain the corresponding entry content in the memory 404 according to the physical address in the read-write queue, and send the obtained entry content to the Return to scheduling unit 105.

As shown in FIG. 4, the number of cache management control sub-units 403 may be multiple, and each cache management control sub-unit 403 is responsible for a continuous physical address space of the memory 404. The read-write queue may be implemented in the form of a register. The memory 404 can be implemented in the form of a random access memory (RAM). The following implementation examples are described. The address resolution subunit 401 maintains a data register and a control register corresponding to the read and write operations, wherein the data register is used. The control register is used to control the read and write operations of the data register to store data to be written to the memory 404 (ie, the content of the next published item) or data to be read (ie, the contents of the entry to be searched).

FIG. 5 is a schematic structural diagram of a control register according to an embodiment of the present invention. As shown in FIG. 5, the read command write_cmd, the write command read_cmd, the RAM block select ram_sel, and the RAM address ram_addr are four fields, and the RAM is accessed when the control register is parsed. The specific address, if the current write command is valid, the data is written into the corresponding RAM, as the current read command is valid, Read out the data in the corresponding address.

In an actual application, when the entry management unit 107 delivers the content of the entry (including the first storage and update of the entry), the content of the entry is written into the corresponding memory 404 according to the information in the SDT unit 101, and the memory 404 Types include on-chip and off-chip.

For example, if the content of the corresponding item is directly searched for, the content of the item to be delivered is directly written into the memory 404 through the Peripheral Component Interface (PCI-E) according to the information directly corresponding to the search in the SDT unit 101. In the meantime, in order to improve the delivery speed of the content of the entry, the direct memory access (DMA) mode can be used for delivery;

For the first lookup and the second lookup of the corresponding entry, the content of the entry to be delivered is written into the entry management unit according to the information corresponding to the first search and the second search by the SDT unit 101. In the cache of the own, the content of the table item to be delivered is forwarded to the corresponding on-chip memory 304 or off-chip memory 404 by calling a hardware interface function.

FIG. 6 is a schematic structural diagram of an entry management unit 107 according to an embodiment of the present invention. As shown in FIG. 6, the method includes:

The central processing sub-unit 601 is configured to directly search for the corresponding entry content according to the information directly corresponding to the search in the SDT 101, and send the content to the entry management sub-unit 602, and trigger the entry management sub-unit 602; The information corresponding to the first search and the second search, the first search and the second search corresponding entry content, is sent to the entry management sub-unit 602, and triggers the entry management sub-unit 602;

The item management sub-unit 602 is configured to directly search for the corresponding item content delivered by the central processing sub-unit 601, and write the content of the corresponding item to the memory 404 through the fast peripheral component interface PCI-E; The content of the corresponding entry in the first search and the second search is written into the entry management unit cache sub-unit 603 by calling the memory read/write function, and the contents of the entry of the cache sub-unit 603 are forwarded to the corresponding by calling the hardware interface function. On-chip memory 404 or off-chip memory Reservoir 404.

FIG. 7 is a schematic flowchart of an implementation process of an entry management method according to an embodiment of the present invention, which is applied to the entry management device shown in FIG. 1; as shown in FIG. 7, the following steps are included:

Step 701: The SDT unit 101 maintains the entry length and the entry base address corresponding to the first lookup of the entry, and the entry length and the entry base address corresponding to the second lookup of the entry.

Step 702: The lookup scheduling unit 102 performs the first lookup according to the entry length and the entry base address corresponding to the first lookup initiated by the lookup interface, and the first lookup initiated by the lookup interface. The key value, initiates a first lookup to the secondary lookup management unit 103.

Step 703: The lookup scheduling unit 102 returns an offset according to the first lookup returned by the second-level lookup management unit 103, and an entry length and an entry corresponding to the second lookup in the SDT unit 101. The base address initiates a second lookup to the cache management unit 104.

Step 704: The return scheduling unit 105 sends the content of the second searched entry returned by the cache management unit 104 to the corresponding search interface.

Preferably, the method further includes:

The SDT unit 101 maintains the information of the search algorithm used for the first search; the search and scheduling unit 102 determines the information of the search algorithm corresponding to the first search initiated by the search interface in the SDT unit 101. The second lookup management unit 103 responds to the corresponding lookup algorithm, and initiates a first lookup to the cache management unit 104 through the determined secondary lookup management unit 103.

Preferably, the device further includes a secondary search unit 106 corresponding to the secondary search management unit 103; correspondingly, the method further includes:

The second-level search management unit 103, according to the first lookup corresponding to the first lookup initiated by the lookup interface in the SDT unit 101, and the base address of the entry, and corresponding to the first check Finding the key value, and initiating a first search to the corresponding secondary search unit 106;

The second-level searching unit 106 is configured according to the length of the entry corresponding to the first search initiated by the search interface in the SDT unit 101, the base address of the entry, and the key value corresponding to the first search. The cache management unit 104 requests the corresponding offset information.

Preferably, the method further includes:

The SDT unit 101 maintains information corresponding to the target memory type of the first lookup; the secondary search unit 106 according to the type information of the target memory corresponding to the first search initiated by the lookup interface in the SDT unit 101, Requesting offset information from the corresponding cache management unit 104;

The cache management unit 104 searches for the offset information in the corresponding memory according to the request of the offset information of the secondary search unit 106.

Preferably, the method further includes:

The SDT unit 101 maintains information corresponding to the target memory type of the second search; the search scheduling unit 102 according to the type information of the target memory corresponding to the second search in the SDT unit 101, to the corresponding cache. The management unit 104 requests the contents of the entry.

Preferably, the method further includes:

The SDT unit 101 maintains an enable identifier for the second search;

The search scheduling unit 102 determines whether the enable identifier of the second search corresponding to the first search sent by the search interface is valid, when the offset returned by the second-level search management unit 103 is received, if If so, a second lookup is initiated to the cache management unit 104, otherwise; the received offset information is sent to a lookup interface that initiates the first lookup to request the offset information.

Preferably, the method further includes:

The SDT unit 101 maintains a direct search for a corresponding entry length and an entry base address; the lookup scheduling unit 102 initiates according to the search interface in the SDT unit 101. Directly searching for the corresponding entry length and the base address of the entry, and the key value sent by the lookup interface when initiating a direct lookup initiates a direct lookup;

The return scheduling unit 105 sends the content of the entry returned by the direct search returned by the cache management unit 104 to the lookup interface that initiates the direct lookup to request the content of the corresponding entry.

Preferably, the method further includes:

The SDT unit 101 maintains information corresponding to the target memory type directly searched and directly searches for the used algorithm information;

The lookup scheduling unit 102 requests the content of the entry from the corresponding cache management unit 104 according to the type information of the target memory corresponding to the direct search in the SDT unit 101 and the algorithm information used for directly searching.

Preferably, the method further includes:

The return scheduling unit 105 determines the sequence of the first search or the direct search initiation according to the first search of the content of the same entry or directly searches for the corresponding pointer, according to the determined sequence, The contents of the entry returned by the cache management unit 104 are sent to a lookup interface that initiates the first lookup or the direct lookup.

Preferably, the device further includes: an entry management unit 107; and correspondingly, the method further includes:

The entry management unit 107 delivers, by the cache management unit 104, the direct search, the content of the entry corresponding to the second search, and the offset information corresponding to the first search to the corresponding type. Memory.

Preferably, the method further includes:

Maintain the enable identifier for the second lookup;

When the first identification of the corresponding entry is completed, the offset information of the first search and the second searched entry corresponding to the first search are preset. Type, table item base address, and table item length for a second lookup. The direct lookup table entry base address is a stored start address of an entry corresponding to the same entry type. In the embodiment of the present invention, the content of the first searched entry of the same search algorithm is in the corresponding on-chip memory or The off-chip memory utilizes contiguous spatial storage, the starting address of which is the base address of the first lookup entry type.

The direct lookup table entry length is the length of each entry for the first lookup using the same lookup algorithm.

In an actual application, when the entry management device in the embodiment of the present invention is applied to a scenario in which the number of maintenance entries is large and the search frequency is high, in order to avoid searching for congestion, and ensuring the response rate to the search, the lookup scheduling unit 102 The type of target memory for one lookup, second lookup, and direct lookup, and the lookup algorithm used, caches the first lookup, the second lookup, and the direct lookup for the corresponding key and the corresponding information in the SDT table. In the corresponding queue, according to the preset load balancing policy, the first search, the second search, and the direct search of the cache are scheduled, and the first search, the second search, or the direct search is initiated, and The corresponding lookup interface identifier is sent when the first lookup, the second lookup, or the direct lookup is initiated.

The entry base address of the entry is a stored start address of an entry corresponding to the same entry type. In the embodiment of the present invention, the content of the first searched entry of the same search algorithm is in the corresponding on-chip memory or off-chip. The memory utilizes contiguous spatial storage, the starting address of which is the base address of the first lookup entry type.

The entry length is the length of each entry for the first lookup using the same lookup algorithm.

The search algorithm includes: a hash search algorithm, a route lookup algorithm, and a TCAM-based high-speed route search algorithm; the above search algorithms are secondary search algorithms, that is, the content of the entry to be searched needs to be determined by the first search. The offset information of the entry is searched for a second time according to the offset information determined by the first lookup, and the content of the entry to be searched is determined.

The types of target memory include on-chip memory and off-chip memory. The embodiment of the invention further describes a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the entry management method shown in FIG. 7.

The entry management device and the entry management method provided by the embodiment of the present invention, by using preset information corresponding to direct search, first search, and second search, for example, lookup entry type, lookup entry length, and lookup The base address of the entry, which implements flexible configuration of entry storage;

Indirect addressing is used when looking up table entries, overcoming direct addressing in traditional techniques

The disadvantage of occupying a large bus address space brought by RAM can be widely applied to other item management scenarios with less address space.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the invention can take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing device to produce a machine such that Instructions executed by a processor of a computer or other programmable data processing device generate means configured to implement the functions specified in a block or blocks of a flow or a flow and/or a block diagram of the flowchart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps that are configured to implement the functions specified in one or more blocks of the flowchart or in a block or blocks of the flowchart.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

claims

1. A table entry management device, the device includes: a structure definition table SDT unit, a search scheduling unit, a secondary search management unit, a cache management unit and a return scheduling unit; wherein,

The SDT unit is configured to maintain the entry length and entry base address corresponding to the first search for the entry, and the entry length and entry base address corresponding to the second search for the entry; the search The scheduling unit is configured to calculate the entry length and base address of the entry corresponding to the first lookup initiated by the lookup interface in the SDT unit, and the entry corresponding to the first lookup sent when the lookup interface initiates the first lookup. Search key value, initiate the first search to the secondary search management unit, and based on the offset returned by the secondary search management unit and the entry length corresponding to the second search in the SDT unit and the table entry base address, initiate a second search to the cache management unit;

The return scheduling unit is configured to send the entry content of the second search returned by the cache management unit to the corresponding search interface.

2. The device according to claim 1, wherein,

The SDT unit is also configured to maintain the information of the search algorithm used for the first search; the search scheduling unit is also configured to perform a search corresponding to the first search initiated by the search interface in the SDT unit. Based on the algorithm information, the secondary search management unit that responds to the corresponding search algorithm is determined, and the first search is initiated to the cache management unit through the determined secondary search management unit.

3. The device according to claim 2, wherein the device further includes a secondary search unit corresponding to the secondary search management unit;

The secondary search management unit is also configured to determine the entry length and entry base address corresponding to the first search initiated by the search interface in the SDT unit, as well as the key value corresponding to the first search. , initiate the first search to the corresponding secondary search unit;

The secondary search unit is also configured to send a message to the search interface according to the SDT unit. The entry length and entry base address corresponding to the first search, as well as the key value corresponding to the first search, are requested from the cache management unit for the corresponding offset information.

4. The device according to claim 3, wherein,

The SDT unit is further configured to maintain information corresponding to the target memory type of the first search. The secondary search unit is also configured to determine the target memory corresponding to the first search initiated by the search interface in the SDT unit. Type information, request offset information from the corresponding cache management unit;

The cache management unit is further configured to search for offset information in the corresponding memory according to the request for offset information from the secondary search unit.

5. The device according to claim 1, wherein,

The SDT unit is further configured to maintain information corresponding to the target memory type of the second search. The search scheduling unit is further configured to maintain information on the type of target memory corresponding to the second search in the SDT unit. Request the entry content from the corresponding cache management unit.

6. The device according to claim 1, wherein,

The SDT unit is also configured to maintain the enable identification of the second search;

The search scheduling unit is also configured to, when receiving the offset returned by the secondary search management unit, determine whether the enable flag of the second search corresponding to the first search initiated by the search interface is valid. , if valid, initiate a second search to the cache management unit; otherwise, send the received offset information to the search interface that initiated the first search to request the offset information.

7. The device according to claim 1, wherein,

The SDT unit is also configured to maintain the entry length and entry base address corresponding to the direct lookup; the lookup scheduling unit is also configured to send messages based on the lookup interface in the SDT unit. The entry length and entry base address corresponding to the direct lookup initiated, as well as the key value sent when the lookup interface initiates a direct lookup, initiate a direct lookup to the cache management unit;

The return scheduling unit is configured to send the direct lookup entry content returned by the cache management unit to the lookup interface that initiates the direct lookup to request the corresponding entry content.

8. The device according to claim 7, wherein,

The SDT unit is also configured to maintain information corresponding to the target memory type of the direct search and algorithm information used by the direct search;

The search scheduling unit is further configured to request the entry content from the corresponding cache management unit according to the type information of the target memory corresponding to the direct search in the SDT unit and the algorithm information used for the direct search.

9. The device according to claim 7 or 8, wherein,

The return scheduling unit is also configured to determine the order in which the first search or the direct search is initiated based on the first search or direct search for the same entry content, in accordance with the determined order. The entry content returned by the cache management unit is sent to the search interface that initiated the first search or the direct search.

10. The device according to claim 7 or 8, wherein the device further includes: an entry management unit configured to use the cache management unit to perform the direct search and the second search on the corresponding entry. The content and offset information corresponding to the first search are sent to the corresponding type of memory.

11. A table entry management method, applied to a table entry management device, the device includes: a structure definition table SDT unit, a search scheduling unit, a secondary search management unit, a cache management unit and a return scheduling unit; the method includes :

The SDT unit maintains the entry length and entry base address corresponding to the first search for the entry, and the entry length and entry base address corresponding to the second search for the entry;

The search scheduling unit determines the length of the entry corresponding to the first search initiated by the search interface. and the base address of the table entry, and the key value corresponding to the first search sent when the search interface initiates the first search, initiates the first search to the second-level search management unit, and based on the second-level search management unit The offset returned by the first search returned by the search management unit, as well as the entry length and entry base address corresponding to the second search in the SDT unit, initiate a second search to the cache management unit;

The return scheduling unit sends the entry content of the second search returned by the cache management unit to the corresponding search interface.

12. The method according to claim 11, wherein the method further includes:

The SDT unit maintains information on the search algorithm used for the first search;

The search scheduling unit determines the secondary search management unit that responds to the corresponding search algorithm based on the information of the search algorithm corresponding to the first search initiated by the search interface in the SDT unit, and uses the determined secondary search The management unit initiates the first search to the cache management unit.

13. The method according to claim 12, wherein the device further includes a secondary search unit corresponding to the secondary search management unit; accordingly, the method further includes:

The secondary search management unit sends a query to the corresponding entry in the SDT unit according to the entry length and entry base address corresponding to the first search initiated by the search interface, and the key value corresponding to the first search. The secondary search unit initiates the first search;

The secondary search unit sends a query to the cache according to the entry length and entry base address in the SDT unit corresponding to the first search initiated by the search interface, and the key value corresponding to the first search. The snap-in requests the corresponding offset information.

14. The method according to claim 13, wherein the method further includes:

The SDT unit maintains information corresponding to the target memory type for the first search; the secondary search unit searches for the corresponding target memory based on the type information of the target memory corresponding to the first search initiated by the search interface in the SDT unit. The cache management unit requests offset information; The cache management unit searches for offset information in the corresponding memory according to the offset information request of the secondary search unit.

15. The method according to claim 11, wherein the method further includes: the SDT unit maintains information corresponding to the target memory type of the second search; the search scheduling unit determines Search the type information of the corresponding target memory for the second time, and request the entry content from the corresponding cache management unit.

16. The method according to claim 11, wherein the method further includes: the SDT unit maintaining an enable flag for the second search;

When the search scheduling unit receives the offset returned by the secondary search management unit, it determines whether the enable flag of the second search corresponding to the first search sent by the search interface is valid. If it is valid, Then initiate a second search to the cache management unit, otherwise; send the received offset information to the search interface that initiated the first search to request the offset information.

17. The method according to claim 11, wherein the method further includes: the SDT unit maintains the entry length and entry base address corresponding to the direct search; the search scheduling unit determines the entry length and entry base address corresponding to the direct search; The entry length and entry base address corresponding to the direct search initiated by the search interface, and the key value sent when the search interface initiates the direct search initiates the direct search;

The return scheduling unit sends the entry content returned by the direct lookup returned by the cache management unit to the lookup interface that initiates the direct lookup to request the corresponding entry content.

18. The method according to claim 17, wherein the method further includes: the SDT unit maintains the information of the target memory type corresponding to the direct search and the algorithm information used by the direct search;

The search scheduling unit requests the corresponding cache management unit according to the type information of the target memory corresponding to the direct search in the SDT unit and the algorithm information used by the direct search. Find the table item content.

19. The method according to claim 17 or 18, wherein the method further includes: the return scheduling unit determines the first search according to the first search of the same entry content or directly searches the corresponding pointer. The search or the direct search is initiated in the order in which the entry content returned by the cache management unit is sent to the search interface that initiated the first search or the direct search according to the determined order.

20. The method according to claim 17 or 18, wherein the device further includes: an entry management unit; accordingly, the method further includes:

The entry management unit delivers the direct search, the entry content corresponding to the second search, and the offset information corresponding to the first search to the corresponding type of memory through the cache management unit.

21. A computer storage medium, the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the entry management method described in any one of claims 11 to 20.