Cisco Technology, Inc.

Amir Michaeli

Doron Shoham

Chandrashekhar Appanna

David J Tsiang

Vitaly Sukonik

Niv Margalit

Meir Schreiber

Sarig Livne

Ofer Bardan

Ehud Finkelstein

David Tsiang

Systems and methods are disclosed for implementing and using data structures comprised of a hierarchy of queues or linked list data structures. A queue or linked list typically comprises a distributor, a plurality of sub-queues or sub-linked lists, and a receiver. The distributor distributes a plurality of items to be added to the queue or linked list to the plurality of sub-queues or sub-linked lists in an order, and the receiver receives the items from these elements in the same order. Entries for the queues and/or linked lists may be stored in a common memory. Stages of selectors may be used to select a current queue or linked list and a particular sub-queue or linked list. The number of queues/linked lists and sub-queues/sub-linked lists is unbounded and can be sized according to the needs of the system, such as to overcome a memory access speed limitation.

Method and apparatus for a data structure comprising a hierarchy of queues or linked list data structures

Regular expression matching is performed on a sequence of characters using a pipeline architecture of regular expression matching stages. Multiple regular expression matching stages are connected together in a pipeline manner, with each of these regular expression matching stages corresponding to a different portions of the regular expression. These stages are response to indications from their immediately preceding stages (if they have a preceding stage) of whether or not a progressive match was determined. If all preceding stages matched for corresponding characters of the sequence of characters, then a stage will identify whether or not the current character matches its programmed portion of the regular expression to a next stage or to another device (e.g., the final stage may indicate to a packet processor whether or not the regular expression is matched).

Pipeline regular expression matching

Disclosed are, inter alia, methods, apparatus, data structures, computer-readable media, and mechanisms, for scheduling items in a system, such as, but not limited to a computer or communications system. For example, in one implementation, each of the items in a set of items has an associated deficit and mini-deficit. A next particular item is selected from the set of items currently having enough deficit to process the particular item. One or more entities associated with the particular item is processed a commensurate amount corresponding to the mini-deficit associated with the particular item. This processing is repeatedly performed until there are no more entities associated with the particular item or until the deficit associated with the particular item does not allow any further processing at the current time.

Scheduling items using mini-quantum values

Methods and apparatus are disclosed for dynamically mapping between sets of entities. In one implementation, queues corresponding to a particular output are mapped into a sequential set of renamed queue identifiers. In transmitting an item, a particular renamed queue identifier is selected, and then the particular item is communicated from the actual queue to the particular output. In one implementation, groups corresponding to a particular output are mapped into a sequential set of renamed group identifiers, and queues corresponding to a particular renamed group are mapped into a sequential set of renamed queue identifiers. In transmitting an item, a particular renamed group identifier is selected, and then a particular renamed queue identifier from within is selected. In one implementation, a second set of mappings is generated while the system uses a first set of mappings, and then the system switches in real-time to the second set of mappings.

Method and apparatus for generating and using dynamic mappings between sets of entities such as between output queues and ports in a communications system

Methods and apparatus are disclosed for scheduling items (e.g., packets, processes, etc.) in a system, such as, but not limited to a computer or communications system (e.g., router, switch, etc.) In one implementation, multiple sets of items requiring processing to be performed are maintained. A current set of the multiple sets of items is identified. Each of the items in the current set is processed. In one implementation, this processing includes identifying a particular item in the current set, adding a quantum to a deficit of the particular item, processing an entity corresponding to the particular item, decreasing the deficit of the particular item by a value, determining if the deficit allows the particular item to be further processed, and moving the particular item from the current set to another of the multiple sets of items after said determining if deficit allows the particular item to be further processed.

Method and apparatus for scheduling and interleaving items using quantum and deficit values including but not limited to systems using multiple active sets of items or mini-quantum values

Growing community of inventors

Hertzelya, Israel

Amir Michaeli