Patents by Inventor William Brad MATTHEWS

William Brad MATTHEWS has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10868769
    Abstract: To more efficiently utilize buffer resources, schedulers within a traffic manager may generate and queue read instructions for reading buffered portions of data units that are ready to be sent to the egress blocks. The traffic manager may be configured to select a read instruction for a given buffer bank from the read instruction queues based on a scoring mechanism or other selection logic. To avoid sending too much data to an egress block during a given time slot, once a data unit portion has been read from the buffer, it may be temporarily stored in a shallow read data cache. Alternatively, a single, non-bank specific controller may determine all of the read instructions and write operations that should be executed in a given time slot. The read instruction queue architecture may be duplicated for link memories and other memories in addition to the buffer memory.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: December 15, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Bruce Hui Kwan
  • Patent number: 10868768
    Abstract: When a measure of buffer space queued for garbage collection in a network device grows beyond a certain threshold, one or more actions are taken to decreasing an enqueue rate of certain classes of traffic, such as of multicast traffic, whose reception may have caused and/or be likely to exacerbate garbage-collection-related performance issues. When the amount of buffer space queued for garbage collection shrinks to an acceptable level, these one or more actions may be reversed. In an embodiment, to more optimally handle multi-destination traffic, queue admission control logic for high-priority multi-destination data units, such as mirrored traffic, may be performed for each destination of the data units prior to linking the data units to a replication queue. If a high-priority multi-destination data unit is admitted to any queue, the high-priority multi-destination data unit can no longer be dropped, and is linked to a replication queue for replication.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: December 15, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Bruce Hui Kwan, Ajit Kumar Jain
  • Patent number: 10846225
    Abstract: A logical bank may comprise multiple physical banks across which logical blocks, such as buffer entries, are striped. Data structures are stored in the logical blocks, with each logical block storing no more than one data structure. When writing a data structure, if the data structure is less than half the logical block size, one or more duplicate copies of the data structure may be stored in the otherwise unused physical blocks of the logical block. Before executing a first read instruction to read a first data structure from a first logical block, if the first data structure can be read without accessing one or more of the physical banks, a second read instruction for a second data structure may be analyzed to determine if there is a copy of a second data structure within the one or more unneeded physical banks. If so, the two read instructions are consolidated.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: November 24, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Bruce Hui Kwan
  • Patent number: 10795873
    Abstract: Certain hash-based operations in network devices and other devices, such as mapping and/or lookup operations, are improved by manipulating a hash key prior to executing a hash function on the hash key and/or by manipulating outputs of a hash function. A device may be configured to manipulate hash keys and/or outputs using manipulation logic based on one or more predefined manipulation values. A similar hash-based operation may be performed by multiple devices within a network of computing devices. Different devices may utilize different predefined manipulation values for their respective implementations of the manipulation logic. For instance, each device may assign itself a random mask value for key transformation logic as part of an initialization process when the device powers up and/or each time the device reboots. In an embodiment, described techniques may increase the entropy of hashing function outputs in certain contexts, thereby increasing the effectiveness of certain hashing functions.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: October 6, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal
  • Patent number: 10764208
    Abstract: A distributed switch architecture supports very high bandwidth applications. For instance, the distributed switch architecture may be implemented for cloud networks. The architecture scales by organizing traffic management components into tiled structures with distributed buffering. The tile structures are replicated and interconnected to perform transfers from ingress to egress using an interconnect bandwidth scheduling algorithm. Bandwidth scaling may be achieved by adding more tiles to achieve higher bandwidth. The interconnect in the architecture may be swapped out depending on implementation parameters, e.g., physical efficiency.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: September 1, 2020
    Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITED
    Inventors: Amit Kumar, William Brad Matthews, Bruce Hui Kwan, Puneet Agarwal
  • Patent number: 10740006
    Abstract: A memory system for a network device is described. The memory system includes a main memory configured to store one or more data elements. Further, the memory system includes a link memory that is configured to maintain one or more pointers to interconnect the one or more data elements stored in the main memory. The memory system also includes a free-entry manager that is configured to generate an available bank set including one or more locations in the link memory. In addition, the memory system includes a context manager that is configured to maintain metadata for a list of the one or more data elements.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: August 11, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Bruce H. Kwan, Mohammad K. Issa, Neil Barrett, Avinash Gyanendra Mani
  • Patent number: 10742558
    Abstract: A traffic manager is shared amongst two or more egress blocks of a network device, thereby allowing traffic management resources to be shared between the egress blocks. Among other aspects, this may reduce power demands and allow a larger amount of buffer memory to be available to a given egress block that may be experiencing high traffic loads. Optionally, the shared traffic manager may be leveraged to reduce the resources required to handle data units on ingress. Rather than buffer the entire unit in the ingress buffers, an arbiter may be configured to buffer only the control portion of the data unit. The payload of the data unit, by contrast, is forwarded directly to the shared traffic manager, where it is placed in the egress buffers. Because the payload is not being buffered in the ingress buffers, the ingress buffer memory may be greatly reduced.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: August 11, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Bruce Hui Kwan
  • Patent number: 10735339
    Abstract: A network device organizes packets into various queues, in which the packets await processing. Queue management logic tracks how long certain packet(s), such as a designated marker packet, remain in a queue. Based thereon, the logic produces a measure of delay for the queue, referred to herein as the “queue delay.” Based on a comparison of the current queue delay to one or more thresholds, various associated delay-based actions may be performed, such as tagging and/or dropping packets departing from the queue, or preventing addition enqueues to the queue. In an embodiment, a queue may be expired based on the queue delay, and all packets dropped. In other embodiments, when a packet is dropped prior to enqueue into an assigned queue, copies of some or all of the packets already within the queue at the time the packet was dropped may be forwarded to a visibility component for analysis.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: August 4, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Ajit Kumar Jain
  • Patent number: 10735337
    Abstract: A network traffic manager receives, from an ingress port, a cell of a packet destined for an egress port. Upon determining that a number of cells of the packet stored in a buffer queue meets a threshold value, the manager checks whether the ingress port has been assigned a token corresponding to the queue. Upon determining that the ingress port has been assigned the token, the manager determines whether other cells of the packet are stored in the buffer, in response to which the manager stores the received cell in the buffer, and stores linking information for the received cell in a receive context for the packet. When all cells of the packet have been received, the manager copies linking information for the packet cells from the receive context to the buffer queue or a copy generator queue, and releases the token from the ingress port.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: August 4, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Bruce H. Kwan, Ajit K. Jain
  • Patent number: 10673770
    Abstract: A network device organizes packets into various queues, in which the packets await processing. Queue management logic tracks how long certain packet(s), such as a designated marker packet, remain in a queue. Based thereon, the logic produces a measure of delay for the queue, referred to herein as the “queue delay.” Based on a comparison of the current queue delay to one or more thresholds, various associated delay-based actions may be performed, such as tagging and/or dropping packets departing from the queue, or preventing addition enqueues to the queue. In an embodiment, a queue may be expired based on the queue delay, and all packets dropped. In other embodiments, when a packet is dropped prior to enqueue into an assigned queue, copies of some or all of the packets already within the queue at the time the packet was dropped may be forwarded to a visibility component for analysis.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: June 2, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Ajit Kumar Jain
  • Patent number: 10652154
    Abstract: Approaches, techniques, and mechanisms facilitate actionable reporting of network state information and real-time, autonomous network engineering directly in-network at a switch or other network device. A data collector within the network device collects state information and/or data unit information from various device components, such as traffic managers and packet processors. The data collector, which may optionally generate additional state information by performing various calculations on the information it receives, is configured to then provide at least some of the state information to an analyzer device connected to an analyzer interface. The analyzer device, which may be a separate device, performs various analyses on the state information, depending on how it is configured. The analyzer device outputs reports that identify statuses, errors, misconfigurations, and/or suggested actions to take to improve operation of the network device.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: May 12, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Bruce Hui Kwan
  • Patent number: 10601711
    Abstract: Certain hash-based operations in network devices and other devices, such as mapping and/or lookup operations, are improved by manipulating a hash key prior to executing a hash function on the hash key and/or by manipulating outputs of a hash function. A device may be configured to manipulate hash keys and/or outputs using manipulation logic based on one or more predefined manipulation values. A similar hash-based operation may be performed by multiple devices within a network of computing devices. Different devices may utilize different predefined manipulation values for their respective implementations of the manipulation logic. For instance, each device may assign itself a random mask value for key transformation logic as part of an initialization process when the device powers up and/or each time the device reboots. In an embodiment, described techniques may increase the entropy of hashing function outputs in certain contexts, thereby increasing the effectiveness of certain hashing functions.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: March 24, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal
  • Patent number: 10581759
    Abstract: The efficiency of the network device is improved by sharing a packet processor across two or more control paths. Data unit sources send the first portion of each data unit that passes through the sources to the shared packet processor via their respective control paths. The packet processor generates control information for each of the data units, and sends the control information to a merger component that corresponds to the source of the data unit. The merger component merges the control information with a payload portion of the data unit that the data unit source sent along a separate data path. To better facilitate the sharing of the packet processor, the control paths may converge at an adaptive distributor, which uses a policy-based mechanism to select which data unit portion to forward to the packet processor in a given time slot. The policy may change based on various demand measures.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: March 3, 2020
    Assignee: Innovium, Inc.
    Inventors: Bruce Hui Kwan, William Brad Matthews, Puneet Agarwal
  • Patent number: 10574577
    Abstract: Approaches, techniques, and mechanisms are disclosed for assigning paths to network packets. The path assignment techniques utilize path state information and/or other criteria to determine whether to route a packet along a primary candidate path selected for the packet, or one or more alternative candidate paths selected for the packet. According to an embodiment, network traffic is at least partially balanced by redistributing only a portion of the traffic that would have been assigned to a given primary path. Move-eligibility criteria are applied to traffic to determine whether a given packet is eligible for reassignment from a primary path to an alternative path. The move-eligibility criteria determine which portion of the network traffic to move and which portion to allow to proceed as normal. In an embodiment, the criteria and functions used to determine whether a packet is redistributable are adjusted over time based on path state information.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: February 25, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Meg Lin, Rupa Budhia
  • Patent number: 10554572
    Abstract: Approaches, techniques, and mechanisms are disclosed for improving the efficiency with which data units are handled within a device, such as a networking device. Received data units, or portions thereof, are temporarily stored within one or more memories of a merging component, while the merging component waits to receive control information for the data units. Once received, the merging component merges the control information with the associated data units. The merging component dispatches the merged data units, or portions thereof, to an interconnect component, which forwards the merged data units to destinations indicated by the control information. The device is configured to intelligently schedule the dispatching of merged data units to the interconnect component. To this end, the device includes a scheduler configured to select which merged data units to dispatch at which times based on a variety of factors described herein.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: February 4, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Paul Roy Kim, Puneet Agarwal
  • Patent number: 10540867
    Abstract: Approaches, techniques, and mechanisms are disclosed for monitoring and reporting status information in a computing device. According to one embodiment, status messages are generated with respect to a subsystem of a computing system, such as a computer chip configured to perform network switching and routing functions in a network device. The status messages convey status information, such as configuration and/or operational states, metrics, or other statistics. A message decoder within the system may be configured to receive and analyze the status messages. Based thereon, the message decoder generates output data in a specific format that controls an output device, such as an LED array. The message decoder then sends the output data to the output device. Enabling the reporting of status information through LED indicators and other typically custom and proprietary output devices is thus greatly simplified. A status chain for collecting and reporting status information is also described.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: January 21, 2020
    Assignee: Innovium, Inc.
    Inventors: Kapil Vishwas Shrikhande, David Alan Jarosh, William Brad Matthews
  • Patent number: 10541946
    Abstract: Nodes within a network are configured to adapt to changing path states, due to congestion, node failures, and/or other factors. A node may selectively convey path information and/or other state information to another node by annotating the information into packets it receives from the other node. A node may selectively reflect these annotated packets back to the other node, or other nodes that subsequently receive these annotated packets may reflect them. A weighted cost multipathing selection technique is improved by dynamically adjusting weights of paths in response to feedback indicating the current state of the network topology, such as collected through these reflected packets. In an embodiment, certain packets that would have been dropped may instead be transformed into “special visibility” packets that may be stored and/or sent for analysis. In an embodiment, insight into the performance of a network device is enhanced through the use of programmable visibility engines.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: January 21, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal
  • Patent number: 10540101
    Abstract: Methods and apparatus for transmit buffers for network devices. One apparatus includes a packing unit, a buffer manager and a plurality of aggregated port buffers, each coupled to receive output from the packing unit. The packing unit is configured to receive packet data as input segments of a first size; generate storage units of a second size; and write each storage unit to a particular aggregated port buffer identified by the buffer manager. The buffer manager is configured to: select a particular aggregated port buffer for each storage unit, and send information to the buffer manager about the selected particular aggregated port buffer; monitor availability of storage space in the aggregated port buffers; control reception of input segments based on storage space availability; and manage transmission of the storage units from the aggregated port buffers to one or more external destinations as output segments of a third size.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: January 21, 2020
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Patrick James Bourke, Puneet Agarwal, Michael John Filardo, Mohammad Kamel Issa, Avinash Gyanendra Mani
  • Patent number: 10523576
    Abstract: Efficient garbage collection techniques for network packets and other units of data are described. Constituent portions of a data unit are stored in buffer entries spread out across multiple distinct banks. Linking data is generated and stored on a per-bank basis. The linking data defines, for each bank in which data for the data unit is stored, a chain of all entries in that bank that store data for the data unit. When the data unit is dropped or otherwise disposed of, a chain's head entry address may be placed in a garbage collection list for the corresponding bank. A garbage collector uses the linking data to gradually follow the chain of entries for the given bank, and frees each entry in the chain along the way. Optionally, certain addresses in the chain, including each chain's tail address, are immediately freed for the corresponding bank, without waiting to follow the chain.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: December 31, 2019
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal, Ajit Kumar Jain
  • Patent number: 10511538
    Abstract: Described techniques enable resource accounting and tracking in high access rate systems using low cost memories. A first set of counters is maintained in relatively lower cost memory. The first counters generally indicate the amount of resources used for each object in a set of objects, but on a potentially delayed basis. A second set of counters of smaller size is stored in a relatively higher cost memory that supports high arrival and departure rates for accurate accounting. Each second counter indicates the amount of resources assigned (or unassigned) to an object since the object's first counter was last updated, and is incremented or decremented whenever this amount changes. A background process is configured to update individual first counters from the corresponding second counters on a recurring basis. The exact times at which a given first counter is updated may vary in accordance with a variety of approaches.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: December 17, 2019
    Assignee: Innovium, Inc.
    Inventors: William Brad Matthews, Puneet Agarwal