Nippon Telegraph and Telephone Corporation

Ntt Advanced Technology Corporation

Yuta Ukon

Shuhei Yoshida

Koyo Nitta

Shoko Oteru

Namiko Ikeda

Koji Yamazaki

Tomoaki Kawamura

Syuhei Yoshida

Masaru Katayama

Kenji Tanaka

Takeshi Sakamoto

Tsuyoshi Ito

Naoki Miura

Yuki Arikawa

Saki Hatta

Akihiko Miyazaki

A data transfer device transfers a received packet. If the transfer destination of the received packet is a data processing device under control, the data transfer device (confirms the state of a shared bus, and if the shared bus is usable, transfers the packet to the data processing device of the transfer destination via the shared bus, gives the use right of the shared bus to one of the data processing devices in response to communication requirements from the data processing devices, and receives, via the shared bus, a packet from the data processing device given the use right.

Data transfer device, data processing device and data processing method

A burst traffic detection device includes a packet receiver configured to receive packets from a network, a flow specification device configured to specify, in accordance with header information of the packets, flow rules, a flow information storage device configured to store flow information of the specified flow rules, a statistical information storage device configured to store statistical information including the total number of packets for each flow rule and/or the total number of bytes for each flow rule, a burst detection device configured to detect the occurrence of burst traffic in accordance with the statistical information, and a detection count storage device configured to store the number of times of the occurrence of burst traffic.

Burst traffic detection device and method

A data acquisition device includes a valid data acquirer configured to acquire valid data from communication data based on an analysis parameter including an offset from a head of the communication data to the valid data and a data length of the valid data and output the acquired valid data.

Data acquisition device and data acquisition method

An embodiment is a data sequence correction method. The data sequence correction method including temporarily saving data with sequence information imparted thereto in a ring buffer, the ring buffer having a predetermined number of storage regions corresponding to the sequence information, and being provided with a monitoring section made up of one, or two or more consecutive sequence numbers, and an acceptance section in which a start or a second sequence number of the monitoring section is a start sequence number, and the sequence number ahead by a count of storage regions of the ring buffer including the start of the monitoring section is an end sequence number.

Data sequence amendment method, packet monitoring apparatus, data sequence amendment device, and data sequence amendment program

A packet processing apparatus includes a packet processor that performs processing on a packet received from a communication line and outputs data that is a result of the processing, a data combiner that concatenates a plurality of pieces of data output from the packet processor to generate a data block, and a combination data transferor that DMA-transfers the data block generated by the data combiner to a data memory. The combination data transferor writes information on an address in the data memory of a beginning of an individual piece of data in the data block to a descriptor that is a data area on a predetermined memory.

Packet processing device and packet processing method

The packet processing apparatus includes a packet memory, a transmission processing unit that writes a plurality of packets to be transmitted to the packet memory to generate a combination packet into which the plurality of packets have been concatenated, a line handling unit that sends packets to a communication line, and a combination packet transfer unit that DMA-transfers the combination packet from the packet memory to the line handling unit. The transmission processing unit writes information on an address in the packet memory of beginning data of an individual packet in the combination packet to a descriptor. The line handling unit separates the DMA-transferred combination packet into a plurality of packets and sends the plurality of packets to the communication line.

A traffic monitoring apparatus includes: a header analysis circuit configured to acquire one or more identifiers from a header of a received packet; a rule registration circuit configured to convert a rule table including rules in which one or more rule elements are registered for each of the rules into a predetermined format and register the rule table in a rule matching circuit; and the rule matching circuit configured to search for rules to be matched with the acquired identifiers.

Traffic monitoring device, and traffic monitoring method

A data sequence correction method for temporarily saving data with sequence information in a ring buffer and performing sequence correction is provided. The ring buffer includes a number of storage regions, a monitoring section having one or more continuous sequence numbers, and an acceptance section having a first or second sequence number of the monitoring section as a start sequence number and a sequence number immediately preceding the start sequence number of the monitoring section as an end sequence number. The method includes, when a value determined based on a remainder obtained by dividing a sequence number of received data by the number of storage regions is inside the acceptance section, writing the received data in a position of the storage region corresponding to the determined value, and when data are written in the entire monitoring section, reading out all the data in the monitoring section.

Data sequence correction method, packet monitoring device, data sequence correction device, and data sequence correction program

A state detection circuit compares a target connection with an immediate previous connection based on an identifier of an incoming packet and detects a post-transitional state of the target connection based on a control flag of the incoming packet and on a pre-transitional state of the target connection detected just before if the target connection is identical with the immediate previous connection; and a connection counting circuit increments or decrements the number of target connections only when the detected post-transitional state indicates a start or end of the target connection.

Network monitoring device and connection counting method

An optimum combination of a loop unrolling number and a circuit parallel number in a high-level synthesis is determined. A circuit synthesis information generation unit sets, as parameter candidates, a plurality of combinations of a loop unrolling number and a circuit parallel number to generate circuit synthesis information indicating a synthesis circuit obtained by high-level synthesis processing for each of the combinations. An optimum parameter determination unit calculates, for each piece of the generated circuit synthesis information, an estimation processing performance related to the synthesis circuit indicated by the circuit synthesis information, and determines an optimum combination of the loop unrolling number and the circuit parallel number based on the circuit synthesis information based on which a maximum estimation processing performance is obtained.

Parameter optimization device, method and program

An embodiment packet capture device comprises: a packet receiver configured to receive a packet from a network; a packet retainer configured to store the received packet in a memory to temporarily retain the received packet; a failure detector configured to determine a communication failure is present in the network; a capture controller configured to determine an operation stop address such that retention of packets from the network in time periods before and after a detection time point of the communication failure is ensured when the communication failure is detected by the failure detector; and a capture data generator configured to output the packet stored in the memory as capture data when a storage destination address of the packet stored in the memory has reached the operation stop address or when at least a predetermined waiting time period has elapsed from the detection time point of the communication failure.

Apparatus and method for capturing packets before and after network communication failure

A network load balancing apparatus has a data buffer for each communication path of a received packet's transfer destinations, calculates a first hash value using a field value contained in the packet, determines, based on the field value of the packet or the first hash value, a communication path of a transfer destination of the packet subject to external transfer control for transmission to a predetermined external server, determines, based on the first hash value, a communication path of a transfer destination of the packet to be subject to priority control, determines, based on a second hash value based on the first hash value, a communication path of a transfer destination of the packet to be subject to load balancing control, to match a preset load balancing situation of the data buffer, and transmits the packet to a data buffer corresponding to the communication path of the transfer destination.

Network load dispersion device and method

An access control unit includes packet buffers provided for each of users, a packet identification unit that stores received packets in a corresponding packet buffer, a scheduling unit that decides a packet buffer to be the object of transfer, a transfer control unit that, in a case that updating of reference data can be performed at an application processing circuit, and also the packet buffer decided by the scheduling unit is different from the current packet buffer that is the object of transfer, updates to reference data corresponding to the packet buffer decided by the scheduling unit, and a buffer selection unit that connects the packet buffers decided to be the object of transfer to the packet transfer unit when updating of reference data is completed.

Access control method, access control device, and data processing device

A flow control device includes an analysis unit identifying a flow of a received packet, a plurality of queues temporarily storing packets sorted according to each flow, an allocation information storage unit storing allocation information regarding a queue allocated for each flow, a sorting unit deciding a queue to be a storage destination of the received packet and sorts the packet based on a result identified by the analysis unit and the allocation information, a saved packet holding unit saving a packet belonging to a flow determined to have no allocation information regarding the queue to be allocated by the sorting unit, and a transmission unit transmitting the packet temporarily stored in the plurality of queues and the packet saved in the saved packet holding unit to a processing unit that processes a packet.

Flow control device and method

A buffer () for temporarily storing a packet is installed in a packet order control circuit (H). A comparison circuit () compares the packet ID of an input packet with a next-selection ID indicating the packet ID of a packet to be selected next in accordance with an order. If the comparison result indicates that the packet ID and the next-selection ID do not match, a control circuit () stores the input packet in a storage position corresponding to the packet ID. If the packet ID and the next-selection ID match, the control circuit () selects the input packet as a target of a transfer process without storing the packet in the buffer (). If the next-selection ID matches the packet ID of a packet stored in the buffer (), the control circuit () selects the packet as a target of the transfer process. This guarantees the packet processing order with few memory resources.

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Tokyo, Japan

Yuta Ukon